A UNIFIED MID-INFRED PHOTONIC SYSTEM FOR INTEGRATED GAS SPECTROSCOPY AND ENTROPY-DRIVEN SECURE FREE-SPACE OPTICAL COMMUNICATION.

Abstract

The invention relates to secure data transmission systems used in the fields of mid-infrared gas spectroscopy, atmospheric entropy-based physical layer security, and free-space optical communication, and its characteristic feature is:It consists of a transmitter terminal (2), a receiver terminal (3), at least one environmental sensing module (4) located at the transmitter terminal (2) and receiver terminal (3) and configured to measure atmospheric gas concentrations, at least one entropy extraction unit (15) which generates a local atmospheric data stream (28) from the gas concentration data obtained from the environmental sensing module (4), at least one cryptographic processing unit (16) which generates a symmetric key (29) depending on the said local atmospheric data stream (28), a network communication channel (21) which transmits the encrypted payload (25) using the symmetric key (29) at the transmitter terminal (2) to the receiver terminal (3), and a free-space optical link (22) which provides a hardware time trigger signal (23) between the transmitter terminal (2) and the receiver terminal (3).

Description

1 TARIFF INTEGRATED GAS SPECTROSCOPY AND ENTROPY-GUIDED UNIFIED CENTER FOR SECURE, FREE SPACE OPTICAL COMMUNICATION. INFRARED PHOTONIC SYSTEM 5 Technological Field: The invention relates to mid-infrared gas spectroscopy and an atmospheric entropy-based physical layer. Secure data transmission used in the fields of security and free-space optical communication 10 It is related to systems. State of the Art: Existing solutions widely used in the field of secure data communication include the major 15 RSA is based on cryptographic methods that rely heavily on mathematical difficulty. In ECC and similar asymmetric encryption approaches, security is based on specific mathematical principles. This is due to the fact that the problems cannot be solved in a practical amount of time with classical computers. with the development of quantum computers and especially prime factorization or discrete The fact that algorithms effective in solving logarithmic problems have become applicable, these 20 This makes the long-term reliability of classical cryptographic approaches questionable. This brings about a solution. Therefore, communication security is not just a matter of mathematical calculation. not because of its difficulty, but because it is obtained from the physical environment and is difficult to copy from the outside. The need arises to base it on sources of randomness. In current technology, quantum switches aim to base security on physical laws. Switch generation or switch distribution systems are also used in these systems. sharing quantum properties of photons such as polarization, phase, or entanglement. This is accomplished through these systems. However, in most cases, these systems use single-photon detectors. Precise optical systems, low-noise sensing elements, and in some applications, 30 This requires complex cooling infrastructures. This situation makes quantum switch deployment possible. This increases the cost of the systems, makes their installation in field conditions more difficult, and 2 applicability to large-scale commercial, military, or industrial communication infrastructures It restricts. In the field of free-space optical communication, atmospheric turbulence, light flickering, Physical effects such as damping and channel changes as a source of randomness 5 Studies on its use are also known. In these approaches, the optical channel Secure key generation or physical layer by evaluating instantaneous changes. Efforts are being made to ensure safety. However, atmospheric conditions are present in the current systems. The source of the variation is often general channel noise or light intensity fluctuation. It is considered as such. Therefore, which physical or chemical 10 randomness The source from which it originates cannot be identified selectively enough, and the security layer, general optical channel behavior rather than a specific structure based on particular molecular signatures It remains committed. One of the major problems in the current technology is the 15 originating from the laser source. hardware power fluctuations and actual physical effects from the atmospheric environment The problem is that the changes are not sufficiently separated from each other. Especially one-way or single-lane changes. In detector-based measurement approaches, the instantaneous power decrease in the laser source affects temperature. connected output change or hardware intensity noise, by the system in the atmosphere This can be interpreted as a real change that has occurred. This situation is key 20 This can lead to the generation of faulty bits during production, false positive results, and the generated bits. This leads to a decrease in the reliability of the keys. Another shortcoming in current atmospheric randomness-based systems is the source of entropy. It is not selectively obtained from specific gas types. The general 25 of the atmospheric channel In systems based on light flickering or behavior, randomness is often widespread. In this sense, it is considered environmental noise. However, in the atmospheric environment, carbon dioxide and the characteristic absorption behavior of certain gases such as nitrous oxide and their time-dependent effects Micro-scale concentration changes result in a more defined and measurable physical entropy. It can provide the source. In known systems, such selected molecular signatures are considered secure. It is sufficient to use it directly and in an integrated way for key production. It has not been developed. 3 In known communication systems, securely sharing or switching keys... Delivering it to the other party also presents a separate technical problem. Classical cryptography Quantum key distribution uses additional protocols for key exchange in systems. In these systems, the secure transfer of the key is ensured by special optical devices. 5 Work is underway. However, transporting the key through any channel, the channel in question... in terms of security, vulnerability to interference, cost and synchronization requirements This creates additional technical challenges. Therefore, where the key is not transmitted directly, Instead, there is a need for structures that are locally derived from the physical environment at both ends. It is located. 10 In addition, the measurements obtained from the physical environment at both the transmitter and receiver sides are the same. It is also known that making it suitable for reliably generating the cryptographic key This is an important issue that needs to be resolved in the systems. Atmospheric conditions change over time and... Since it varies depending on the location, the raw environmental 15 measured by the transmitter and receiver The data may not be exactly the same. Sensor sensitivities, sampling times, local Due to factors such as turbulence, temperature variations, measurement noise, and distance, the two Differences may arise between the data obtained at the endpoints. If these differences are not resolved... In that case, different keys are generated at the two ends, and therefore the encrypted data cannot be decrypted. a risk arises. 20 In conclusion, the current technique involves applying classical cryptographic methods to quantum computers. The vulnerability to these threats, the high cost of quantum key distribution systems, and laser noise in atmospheric randomness-based systems requires sensitive equipment. The mixing of actual atmospheric changes with the source of entropy is specific molecular 25 The fact that it is not selectively identified through signatures ensures that the key is secure and practical. difficulties in sharing and measurement differences on the donor and receiver sides are unreliable. There are technical problems, such as making key production difficult. Therefore, This obtains physical entropy from measurable molecular changes of atmospheric gases. using entropy in local key generation, the key is transmitted over the communication channel 30 a secure data analysis process that does not involve physical layer time triggering. An integrated system that provides support is needed. 4 Description of the invention: The primary purpose of the invention is to ensure the secure transmission of communication data. The theft of the cryptographic key by third parties is a classical mathematical 5 The risk of encryption methods weakening against quantum computers, quantum Key distribution systems require expensive and sensitive hardware, also Laser-based equipment in current safety approaches based on atmospheric noise problems of not being able to distinguish between noise and actual atmospheric changes The aim is to eliminate this. In this context, the invention bases security solely on mathematical difficulty. 10 instead, from instantaneous and stochastic concentration changes of specific gases in the atmosphere It is based on the resulting physical entropy; thus, it provides a natural basis for secure communication. A dynamic, difficult-to-replicate, and physically environment-dependent key production infrastructure. It offers. One of the most important advantages of the invention is the communication channel of the cryptographic key. The advantage is that it eliminates the need for transmission via gas. The transmitter and receiver terminals, gas It generates the key internally by using fluctuations in concentration. This allows the switch to be connected over the network, via cable, or via an optical link. It is not necessary to transport the data; third parties only need to intercept the encrypted data packet. 20 Even then, they are prevented from accessing the key. The invention provides security based on mathematical difficulty in classical cryptographic methods. It offers a physical environment-based security approach as an alternative to this understanding. In classical systems, key generation and security involve the computation of specific algorithms. While enduring the difficulty, the key to the invention is the production of carbon dioxide and nitrous oxide in the atmosphere. This structure is based on the physical entropy obtained from the instantaneous changes of gases such as oxides. the potential of quantum computers on mathematical encryption algorithms It provides a more resilient security layer against these effects. Another advantage of the invention, compared to traditional quantum key distribution systems, is... It offers a more feasible and cost-effective structure. Quantum key distribution These systems often consist of single-photon detectors, precise optical setups, and complex systems. large-scale commercial and field applications require cooling infrastructure. However, this remains limited in terms of technology. The invention, on the other hand, focuses on mid-infrared gas detection and free space technology. by combining optical communication and software-based cryptographic processing components a more accessible, scalable and adaptable to different communication infrastructures 5 It offers a solution. The invention treats atmospheric randomness as general light noise or ordinary turbulence effect. No, based on the measurable molecular absorption characteristics of specific gases. It evaluates 10 selected gases such as carbon dioxide and nitrous oxide. The use of concentration variations makes the source of randomness more selective and physical. This makes it possible to define it as such. In this way, the security layer is general and simulated. not detectable optical noise, but instantaneous molecular noise of the atmospheric region being measured. It depends on the situation. The invention simulates instantaneous power fluctuations in a laser source with real atmospheric gas. It offers a structure that facilitates the separation of their changes. The current one-way system... or variations in laser power in single-detector systems, a real gas in the atmosphere This can be interpreted as a change, leading to erroneous bit generation. In the invention, however, gas... Absorption characteristics, multiple gas measurement, signal processing, and entropy extraction combined in 20 by evaluating hardware-related noise from atmospheric molecular fluctuations. The aim is to separate them. This increases the reliability of the keys produced. and reduces the risk of faulty key production. One of the key advantages offered by the invention is the physical layer between the transmitter and receiver. It is the creation of a supported time-matching mechanism. Free-space optics the connection, at what time the decryption process takes place at the receiving terminal instead of carrying the key. It acts as a hardware trigger that determines when it will be launched in the window. This is why the encrypted data packet simply needs to reach the receiver. not possible, in addition to the locally generated correct key, 30 are needed to decrypt the data. The physical optical triggering condition must also be met. 6 The invention also protects against repeat attacks and the reuse of past data packets. It provides natural protection. Atmospheric gas fluctuations are constant over time. Because it changes, a key generated at a particular time will not be the same at later times. It cannot be recovered. Therefore, an attacker could potentially steal previously transmitted encrypted data. resending the packets, the right atmospheric entropy conditions and the right time 5 It does not provide a meaningful analysis unless the window is available. This structure is dynamic and It enhances future confidentiality by generating temporary keys. The invention also offers an advantage against external eavesdropping attempts. The key has no... Not being sent through the communication channel, a passive listening attacker 10 It also prevents him from obtaining the key. Furthermore, it would require a physical connection to the free-space optical link. The interference causes changes in the signal quality and signal-to-noise ratio of the connection. because of this, the system is made suitable for detecting interference at the physical layer level. It enables this. In this respect, the invention is not only a software-based encryption solution, It offers a secure communication structure supported by a physical layer. 15 The invention's operation in the mid-infrared region provides high sensitivity for gas measurement and It provides selectivity. The mid-infrared region detects gases such as carbon dioxide and nitrous oxide. because it is suitable for the detection of characteristic absorption lines, atmospheric Concentration changes can be measured more reliably. Also, this wavelength is 20 reducing background noise and water vapor-induced disruptive effects in the region This limitation results in a higher signal-to-noise ratio and a more stable measurement infrastructure. It contributes to its realization. The invention is also advantageous in that it provides high spectral stability. Laser 25 Stable operation of the source by current and temperature control, target gases It allows for precise tracking of absorption lines. This enables the measurement of optical data. correlation of changes in the signal with fluctuations in gas concentration This simplifies the process and improves the accuracy of the atmospheric data stream used for key generation. The invention integrates secure communication and environmental sensing within the same system architecture. It combines them. In cases where the system does not transmit communication data securely. 7 or simultaneously, measurement of gases such as carbon dioxide and nitrous oxide in the atmosphere, It can also be used for analysis and monitoring. Thus, the invention is not only cryptographic. It is not only a communication system that provides security, but also environmental monitoring. It functions as an integrated perception and communication platform with significant capabilities. Another advantage of the invention is its applicability in different sectors. In telecommunications infrastructures, especially new low-latency and high-security options are needed. It can be used in next-generation communication systems. In the defense industry, for tactical and physical applications. This could enable the establishment of secure communication lines connected to the site. Space and aviation. in the field of satellite-ground station or platform-to-platform laser communication links 10 It can be considered a layer of security. In the banking and finance sector, it is high. Additional protection against quantum threats in secure data transfers. It can provide the layer. The invention is also scalable in terms of the Internet of Things and autonomous systems. It provides security infrastructure. Sensors, autonomous vehicles, industrial control units. and when secure data transfer is required between networked devices, from the physical environment The derived key approach can provide an additional level of security. This allows the central Dependence on key distribution can be reduced, and environmental conditions can be adapted between end devices. Secure communication can be established. 20 The invention is also adaptable to biomedical applications such as breath analysis. Medium Infrared gas spectroscopy enables the precise measurement of specific gas components. The system provides not only communication security but also diagnosis or monitoring based on gas analysis. This allows it to be used in applications as well. In this respect, the technical aspect of the invention is 25 Its architecture combines secure communication, gas detection, and analysis functions on the same platform. It offers a multi-purpose structure. Explaining the Figures: The invention will be described by referring to the attached figures, so that the features of the invention can be explained. It will be understood and appreciated more clearly, but the purpose of this invention is this obvious 8 It is not about limiting it with regulations. On the contrary, the invention is defined by the accompanying claims. all alternatives, modifications, and options that could be included within the defined area The aim is to cover their equivalences. The details shown are only for the present invention. It is shown to illustrate the preferred arrangements and both the methods shaping, as well as the most useful and 5 rules and conceptual features of the invention It should be understood that these drawings are presented to provide an easily understandable definition. In these drawings; Figure 1 is a block diagram illustrating the operation of the system described in the invention. Figures that will help understand this invention are shown in the attached image (10). They are numbered and their names are given below. Explanation of References: 1. System 15 2. Transmitter terminal 3. Receiving terminal 4. Environmental sensing module 5. Mid-infrared laser source 6. Laser driver unit 20 7. Wavelength control unit 8. Optical alignment element 9. Absorption cell 10. Atmospheric sampling area 11. Photodetector 25 12. Data collection unit 13. Digital signal processing unit 14. Gas concentration calculation unit 15. Entropy extraction unit 16. Cryptographic processing unit 30 17. Key production unit 18. Summarization unit 9 19. Encryption unit 20. Decryption unit 21. Network communication channel 22. Free-space optical link 23. Hardware time trigger signal 5 24. Information reconciliation unit 25. Data payload 26. Encrypted data packet 27. Time window 28. Local atmospheric data stream 10 29. Symmetric key C. Solved data Detailed Description of the Invention: The terminology used here is intended solely to describe specific applications. and does not limit the scope of the invention. Used here The term "and / or" refers to any one or more of the items listed as related. It includes one and all combinations thereof. Also, the singular "one" used here, "one" The terms "number" and "specified" are used in their plural forms unless the context explicitly indicates otherwise. It is designed to include singular forms such as those mentioned above. Furthermore, the terms used in this specification... The terms "includes" and / or "contains" refer to the specified features, steps, processes, It indicates the presence of elements and / or components, but one or more other features, steps, processes, elements, components and / or groups thereof It will be understood that it does not exclude its existence or addition. 25 Unless otherwise noted, all terms used herein (including technical and scientific terms), in the sense that a person with general knowledge in the field to which this invention belongs would generally understand it They have the same meaning. Furthermore, as defined in commonly used dictionaries... 30 The terms will have a meaning consistent with the context of the relevant field and this statement. it should be interpreted as idealized unless otherwise explicitly defined here. or it will be understood that it will not be interpreted in an overly formal sense. The description of the invention will reveal a series of techniques and steps involved. These are: Each of them provides benefits individually, and at the same time, one or more of them can be used together. In some cases, all of the other techniques described may be used in combination. Accordingly, To ensure clarity, each step in the disclosure of the invention should be presented as 5 steps if possible. By doing this, unnecessary repetition of all combinations will be avoided. Together, the specification and claims, such combinations fully constitute an invention and claims. It should be read with the understanding that it falls within its scope. The invention involves integrated gas spectroscopy and entropy-driven safe free-space optics. The invention relates to a combined mid-infrared photonic system (1) developed for communication. The subject system (1) generally consists of a transmitter terminal (2), a receiver terminal (3), Environmental sensing located on the transmitter terminal (2) and receiver terminal (3) Atmospheric data obtained by the modules (4), environmental sensing modules (4) Cryptographic processing units (16) that generate cryptographic keys depending on the encrypted data. a network communication channel (21) that enables transmission and the transmitter terminal (2) and receiver a free space optic that provides hardware time matching between terminal (3) It includes the link (22). The primary goal of the invention is to transmit the cryptographic key directly over a communication channel. without the need to send, by the transmitting terminal (2) and the receiving terminal (3) The aim is to enable local derivation from measured physical atmospheric data. This In the scope of the system (1), atmospheric gases such as carbon dioxide (CO2) and nitrous oxide (N2O) It uses instantaneous concentration changes as a source of physical entropy. Thus, key generation is not merely a mathematical generation of random numbers, but 25 It is measurable and based on a physical randomness dependent on environmental conditions. In the system subject to the invention (1), the transmitter terminal (2) and the receiver terminal (3) have similar functional characteristics. It has an architecture. Each terminal has an environmental measurement system for atmospheric gases. There is a sensing module (4). The environmental sensing module (4) has mid-infrared 30 a laser source (5) operating in the region, operating parameters of the laser source (5) a laser driver unit (6) that regulates the current and temperature values ​​of the laser source (5) 11 a wavelength control unit (7) that keeps the laser beam stable and adjusts it at least one optical alignment element (8) that enables its orientation and alignment, A gas absorption cell (9) that enhances the path of optical interaction with gases, optical signal a photodetector (11) that converts the electrical signal and the signal taken from the photodetector (11) It includes a data acquisition unit (12) that processes the signals. 5 In one application, the laser source (5) is a quantum cascade laser operating in the mid-infrared region. The laser source in question (5) uses carbon dioxide (CO2) and nitrous oxide (N2O). They are selected to target the basic absorption lines of the gases and It is operated. The beam from the laser source (5) passes through the optical alignment element (8) 10 It is collimated via and directed to the gas absorption cell (9). Gas cell (9), interaction of the laser beam with gases in the atmospheric sampling region (10) increasing its length allows for precise detection of small changes in gas concentration. This makes it possible to perceive it in this way. The optical signal from the gas absorption cell (9) is detected by the photodetector (11). It is detected. The photodetector (11) converts the optical signal that reaches it into an analog electrical signal. It converts the analog signal. This analog signal is converted by the data acquisition unit (12). It is digitized and transferred to the digital signal processing unit (13). Digital signal The processing unit (13) extracts the gas absorption information from the obtained signal, 20 It evaluates the noise components in the signal and the presence of carbon dioxide and nitrous oxide. It creates a data structure suitable for calculating concentrations. Gas concentration calculation unit (14) is taken from the digital signal processing unit (13) Carbon dioxide and nitrous oxide concentration values ​​are 25 depending on the processed data. It calculates these values, which provide a representation of the instantaneous atmospheric conditions. It constitutes. However, in the invention, only the absolute gas concentration is considered. Not only the value, but also the micro-level changes over time are evaluated. This Therefore, the data obtained by the gas concentration calculation unit (14), entropy is transferred to the subtraction unit (15). 30 12 Entropy subtraction unit (15) is the carbon dioxide and nitrous oxide concentration values. local atmospheric data stream by analyzing stochastic fluctuations over time (28) constitutes. The atmospheric data flow in question (28) is located at the terminal. It represents the physical randomness specific to the atmospheric cell. Entropy is the unit of inference. (15), sampling, filtering, concentration values ​​measured in an application, 5 It is subject to at least one of the following operations: normalization, windowing, thresholding, and quantization. By holding this data, it produces entropy data suitable for cryptographic processing. One of the key aspects of the invention is the use of specific optical noise instead of general optical noise in key production. This involves using measurable physical changes in atmospheric gases. In this way, 10 The source of randomness is not only momentary changes in laser power or general light. It is not merely a matter of shivering, but also of selected gases such as carbon dioxide and nitrous oxide. It is based on atmospheric data obtained through absorption characteristics. Thus, the system (1) reduces hardware noise and atmospheric molecular changes. It offers a structure that allows for their separation. 15 The cryptographic processing unit (16) receives atmospheric data from the entropy extraction unit (15). It generates a symmetric key (29) using the flow (28). Cryptographic processing unit (16) at least one key production unit (17), one summarization unit (18), one encryption unit (19) and a decryption unit (20) on the receiving terminal (3) side 20 It is located. The key production unit (17) comes from the entropy extraction unit (15). It uses environmental data as input for cryptographic key generation. (Summary) The unit (18) converts the input into a fixed-length key value. In one application, the hash unit (18) uses the SHA-256 hash algorithm to produce 256 It generates a bit symmetric key (29). 25 At the transmitting terminal (2), the payload (25), the encryption unit (19) symmetric key (29) is used for encryption. In one application, the encryption unit (19) is AES-256 It operates according to the encryption protocol. The encrypted data obtained as a result of the encryption process. data packet (26) to the receiving terminal (3) via network communication channel (21) 30 is sent. Network communication channel (21), in an application UDP based low It is a delayed data transmission channel. However, the network communication channel (21) is only 13 It is used for the purpose of carrying the encrypted data packet (26) and the symmetric key (29) He is not being sent through this channel. In the invention, the free space optical link (22) is independent of the network communication channel (21) or It is designed as a physical link that works simultaneously with it. Free space optics 5 The connection (22) is a directed laser between the transmitter terminal (2) and the receiver terminal (3). It is established via a beam of light. This connection is not for carrying the encryption key, but for the receiver. To determine the time interval in which the decryption process will be started in the terminal (3). It is used for this purpose. Therefore, the free space optical link (22) is a hardware time It generates a trigger signal (23) and a physical layer time reference within the system (1) 10 It performs its function. Hardware time trigger signal (23), a time window (27) at the receiver terminal (3) It creates. The receiving terminal (3) receives the encrypted data via the network communication channel (21). It processes the packet (26) within this time window (27). Thanks to this structure, the receiver 15 terminal (3) can only perform decryption with physically verified timing. It starts when the condition is met. Thus, the encrypted data packet (26) is sent to the receiving terminal (3) It is not enough for it to simply reach its destination; it also needs to be a free-space optical link. (22) receiving the incoming hardware time trigger signal (23) appropriately It is necessary. 20 At the receiving terminal (3), there is an environmental sensing module (4) as in the transmitting terminal (2) The receiving terminal (3) environmental sensing module (4) is located in the atmospheric environment where it is located. Carbon dioxide (CO2) and nitrous oxide (N2O) in the sampling area (10) It measures their concentrations. The obtained gas concentration data is sent to the receiving terminal (3) 25 digital signal processing unit (13), gas concentration calculation unit (14) and entropy processed by the extraction unit (15) and sent to the receiving side atmospheric data stream (28) This data stream is converted by the cryptographic processing unit (16) of the receiving terminal (3). It is used in the production of symmetric keys (29). The system (1) will enable the transmitter and receiver terminals to produce compatible switches. It is structured in this way. However, sensor sensitivities, measurement delays, 14 Due to local turbulence differences and environmental variables, the transmitter terminal (2) and the receiver The raw measurement data obtained by terminal (3) may not be exactly the same. This Therefore, the system (1) includes an information reconciliation unit (24). Information is obtained by the reconciliation unit (24), transmitter terminal (2) and receiver terminal (3) 5 Atmospheric data streams (28) suitable for cryptographic key generation It ensures alignment. In an application, the information reconciliation unit (24) is based on quantization. It uses a reconciliation protocol. Within this framework, the measured gas concentration values They are divided into specific intervals and made comparable within time windows (27) and the bit sequence to be used in key generation is determined. Thus, the receiving terminal (3), 10 symmetric key (29) based on its own local measurements without being sent over the network It can derive a switch compatible with the switch used by the transmitter terminal (2). The receiving terminal's (3) decryption unit (20), information reconciliation unit (24) and summarization Network communication channel 15 using the symmetric key (29) obtained by unit (18). (26) decrypts the encrypted data packet coming through (21). The decryption process is free space depending on the hardware time trigger signal (23) received from the optical link (22) is initiated. Thus, the receiving terminal (3) switches to the local atmospheric entropy derived from the entropy. It also decodes the data based on timing information coming from the physical layer. In one application of the invention, the measurement obtained by the environmental sensing module (4) The data is processed via control software. The control software controls the gas sensor. interface, data collection processes, digital signal processing, key generation, encryption, password It can be configured to perform at least one of the following operations: decoding and scheduling. In practice, gas concentration measurement and data collection processes are performed using a LabVIEW-based 25 The interface, cryptographic key generation, and encryption processes are performed using a Python-based system. This can be achieved through a software environment. However, the invention requires a specific programming approach. It is not limited to a particular language or software platform; it performs the same functions. Different software and hardware architectures can also be used. The mid-infrared laser source (5) used in the invention absorbs gases. It is chosen so that its characteristics can be precisely perceived. In an application The system (1) is configured to operate in the wavelength region of approximately 4500 nm. This wavelength region is preferred because carbon dioxide and nitrous oxide gases are in the medium. It enables the utilization of absorption properties in the infrared fingerprint region. Thus, the environmental sensing module (4) detects small and atmospheric gas concentrations. It can detect rapid changes. 5 The free-space optical link (22) used in the invention is independent of data transmission. It can be considered a physical trigger line. This connection is time-based. It can operate with modulation. In this case, the transmitter terminal (2) can operate at certain time intervals. It sends optical trigger pulses. The receiving terminal (3) measures the arrival times of these pulses. By using it, it determines the appropriate time window for the decryption process (27). Thus system (1), encrypted data packets (26) coming through network communication channel (21) It links optical timing information from the physical layer. One of the significant technical implications of the invention is that the switch can transmit data via a communication channel of 15 The advantage is that it eliminates the need for transportation. In classic systems, it provides a secure way to change keys. While a channel or an additional protocol is required, in the system of the invention (1) the switch, transmitter Physical atmospheric data locally by terminal (2) and receiving terminal (3) It is derived. Therefore, only encrypted data can be transmitted through the network communication channel (21). The package (26) is being sent, but the symmetric key (29) is not being sent. 20 Another technical impact of the invention is the integration of cryptographic security with the physical layer. It is the combination of timing. The receiving terminal (3) receives the encrypted data packet (26) only when the correct local atmospheric switch is generated and hardware time triggering The signal (23) can be resolved when the appropriate time window (27) is created. This structure only 25 a third party listening to network traffic or copying encrypted data packets, data without atmospheric entropy data and the same physical timing conditions It makes it difficult to access the content. The system in question (1) can be used for communication security purposes, as well as 30 It can also be used for environmental monitoring purposes when needed. In this context, environmental sensing... module (4), measuring the concentrations of gases such as carbon dioxide and nitrous oxide 16 and can be used for monitoring. In addition, the system (1) can perform breath analysis, greenhouse gas monitoring, Secure communication between Internet of Things devices, data between autonomous systems. transmission, defense communications, space and aeronautical communications, and high-security It can be applied in various fields, such as financial data transfer. The invention is not limited to the example applications described above. Different sensors, different laser sources, different optical cell structures, different photodetectors, different data acquisition methods. units, different gas combinations, different summarization algorithms, different symmetrical encryption algorithms, different information reconciliation methods, and different optical triggering It can also be done using the following arrangements. The important thing is the transmitter terminal (2) and the receiver 10 Obtaining physical entropy from atmospheric gas data measured by terminal (3) This involves deriving a local cryptographic key based on this entropy, and then processing the encrypted data. transmission over a separate communication channel and encryption of the free-space optical link It is used as a physical trigger element that determines the timing of the resolution. 20 30

Claims

17 REQUESTS 1- The invention integrates gas spectroscopy and free-space optics for secure data transmission. It is a communication-based photonic system (1), and its feature is;  a transmitter terminal (2), 5  a receiving terminal (3),  located at the transmitter terminal (2) and the receiver terminal (3) in question and at least one of them is configured to measure atmospheric gas concentrations environmental sensing module (4),  gas concentration data obtained from the environmental sensing module (4) 10 At least one entropy extraction unit (15) forming the local atmospheric data stream (28),  Symmetric key (29) depending on the local atmospheric data flow (28) producing at least one cryptographic processing unit (16),  the payload encrypted using the symmetric key (29) at the transmitting terminal (2) (25) a network communication channel (21) transmitting to the receiving terminal (3) 15  Hardware time triggering between transmitter terminal (2) and receiver terminal (3) It includes a free space optical link (22) that provides the signal (23). 2- The system mentioned in Claim 1 is (1), and its characteristic is; carbon dioxide (CO2) and nitrous oxide. To simultaneously measure the atmospheric concentration changes of (N2O) gases, 20 It is characterized by having a structured environmental sensing module (4). 3- The system mentioned in any of the above requests is (1), and its characteristic is; environmental the sensing module (4), a laser source (5) operating in the mid-infrared region, laser a laser driver unit (6) that operates the source (5), current and temperature of the laser source (5) 25 a wavelength control unit (7) that regulates the values, directs the laser beam at least an optical alignment element (8), a gas absorption that enhances the path of optical interaction with gases cell (9), photodetector (11) which converts the optical signal into an electrical signal and It includes a data acquisition unit (12) that processes the signal received from the photodetector (11). It is a characterization. 30 18 4- The system mentioned in claim 3 is (1), and its characteristic is; carbon dioxide and nitrous oxide. to operate in the wavelength region corresponding to the absorption lines of the gases with having a laser source (5) that operates in the structured mid-infrared region It is the characterization of the situation. 5- The system referred to in Claim 3 or Claim 4 is (1), and its characteristic is that the laser source is (5), It is characterized by being in the form of a quantum cascade laser. 6- The system mentioned in any of the above requests is (1), and its characteristic is; environmental The sensing module (4) obtains gas concentration values ​​from the measured optical signal. a digital signal processing unit (13) and a gas concentration calculator It is characterized by containing unit (14). 7- The system mentioned in any of the above requests is (1), and its characteristic is; gas Sampling, filtering, normalizing, windowing, and thresholding concentration data 15 and has an entropy extraction unit (15) which subjects it to at least one of the quantization operations. It is characterized by its being. 8- The system mentioned in any of the above requests is (1), and its feature is; The cryptographic processing unit (16) uses the local atmospheric data stream (28) to create a symmetric 20 a key (29) producing a key generation unit (17) and the local atmospheric data in question by including a hash unit (18) that converts the stream into a fixed-length key value It is the characterization of the situation. 9- The system mentioned in claim 8 is (1) and its characteristic is; from the local atmospheric data stream (28) 25 The hash unit (18) is configured to generate a 256-bit symmetric key (29). It is characterized by having 10- The system mentioned in any of the above requests is (1), and its characteristic is; transmitter The cryptographic processing unit (16) in the terminal (2) uses the symmetric key 30 to load the data (25). (29) contains an encryption unit (19) which encrypts with (19). 19 11- The system mentioned in any of the above requests is (1), and its feature is; receiver The cryptographic processing unit (16) in the terminal (3) via the network communication channel (21) The received encrypted data packet (26) is converted to a symmetric key generated locally at the receiving terminal (3). It is characterized by containing a decryption unit (20) that solves (29). 12- The system mentioned in any of the above requests is (1), and its characteristic is; transmitter The encrypted data packet (26) coming from the terminal (2) is only generated locally symmetrically. the key (29) is present and the hardware time trigger signal (23) is present If it creates a window (27), the receiving terminal (3) is configured to resolve it. It is characterized by having. 10 13- The system mentioned in any of the above requests is (1), and its feature is; receiver atmospheric obtained by terminal (3), transmitter terminal (2) and receiver terminal (3) an information reconciliation unit (24) to reduce measurement differences between data streams It is characterized by its inclusion. 15 14- The system mentioned in claim 13 is (1), and its features are; transmitter terminal (2) and receiver terminal (3) measured gas concentration values ​​within certain tolerance ranges or Suitable bit for generating symmetric key (29) by aligning through quantization intervals It is characterized by having an information reconciliation unit (24) that forms the sequence. 20 15- The system mentioned in any of the above requests is (1), and its feature is; atmospheric sampling area (10), environmental sensing module (4) carbon dioxide and the physical gas volume that detects concentration changes of nitrous oxide gases It is characterized by being. 25 16- The system mentioned in any of the above requests is (1), and its feature is; network a packet-based communication channel (21) suitable for low-latency data transmission It is characterized by being a communication channel. 17- The system mentioned in any of the above requests is (1), and its characteristic is; environmental gas concentration measurement data obtained by sensing module (4) computation, entropy extraction, key generation, encryption, decryption, and scheduling. by having control software that enables at least one of the processes to be carried out It is the characterization of the situation. 10 20 30

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