34results about How to "Encryption is valid" patented technology

The invention discloses a light DFT-S-OFDM secure transmission system based on a digital chaos. The system comprises three encryption steps all together, i.e., insertion of an OFDM synchronous training sequence, DFT matrix signal preprocessing and subcarrier mapping, wherein an OFDM synchronous training sequence and a subcarrier mapping mode are both generated by a chaotic system, DFT matrix element parameters m and n are generated by the chaotic system, by use of initial value sensitivity and pseudo randomness of the digital chaos, encryption processing is performed on DFT-S-OFDM signals, and thus secret transmission is realized. On one hand, since a security system secret key space is huge, the security of high-speed information transmission can be effectively enhanced, and at the same time, since a DFT matrix can substantially reduce a peak average power ratio (PAPR) of OFDM signals, the performance of the transmission system is also improved; and on the other hand, since multiple iteration optimization and multiple discrete Fourier transformation operation are unnecessary in a DFT matrix signal processing system, the whole system has the following advantages: the system architecture is simple, the calculation amount is small, the transceiver cost is low, and transmission of sideband information is unnecessary.

The invention relates to an encryption system and its encryption method of the computer main board, which is composed of the CPU, the BIOS memory, the encryption processor and the reset controlling circuit. The BIOS memory and the encryption processor are connected to the CPU via the bus. The password check-up program is added to the BIOS start-up procedure stored in the BIOS memory. By this means, the encryption processing to the main board is implemented when the computer's main board starts up. The reset controlling circuit is connected to the encryption processor and the CPU. The encryption processor transfers signals to the reset controlling circuit and force the circuit to generate the reset signal to the CPU to reset the computer's main board. The invention effectively encrypts the main board of the computer and the embedded system.

The invention discloses a system and an implement method thereof for secret communications based on a public communication network voice channel. The system and the implement method thereof for the secret communications based on the public communication network voice channel mainly solve the problem in an existing technology that a voice encryption method of a public communication network is low in reliability, difficult in technique and not convenient to implement. The system for the secret communications based on the public communication network voice channel comprises a power source, and further comprises a processor connected with the power source, and a storage, a digital / analog conversion module, a voice compression / decompression module, an encryption / decryption module, and a digital analogy mapping modulation / demodulation module all connected with the processor. By adopting the scheme, the system and the implement method thereof for the secret communications based on the public communication network voice channel achieve a purpose of conveniently and reliably keeping voice communications confidential, and have high practical value and promotional value.

The invention provides an image encryption method based on a Feistel network and dynamic DNA encoding. The method comprises the following steps: computing a Hash value of an original plaintext image by using a Keccak algorithm, and taking the Hash value as an initial value of a hyper-chaotic Chen system, generating a Hill encryption matrix by using a chaotic sequence generated by the hyper-chaoticChen system so as to replace pixels of an original image; realizing image pixel value diffusion by using the DNA encoding operation as a F function of the Feistel network, and a DNA sequence base asa key of the Feistel network; and performing further diffusion through ciphertext feedback. Through three turns of chaotic scrambling-DNA encoding-Feistel conversion-DNA decoding, the ciphertext randomness and attack resistance are stronger, the scrambling conversion of the image pixel location and the diffusion of the pixel value are realized, and the encryption turn is reduced due to repeated scrambling and DNA encoding and decoding. Through the image encryption method provided by the invention, the image can be effectively encrypted, the plaintext sensitivity is strong, the plaintext attack, the differential attack and the statistical attack can be effectively resisted

The invention provides a text encryption and decryption method for invisible office printing, which can realize strong anti-interference ability, consume very little hardware resources, and have less requirements on the text itself. The present invention proposes a relatively simple and feasible hidden data encryption method. The algorithm is relatively simple. By performing invisible encryption on the document, the time, place, person, unit information and other content can be effectively embedded in the document. Once the document is illegally leaked, it can quickly Effectively locate and query leaking units or personnel. The hardware consumes very little resources; there are few requirements for the text itself, and only a small amount of text or characters can be used to encrypt information; this method has strong anti-interference ability and can effectively resist the impact of text printing on encryption; high concealment , is not easy to be found, which is beneficial to query or trace after the event; there is no visible change to the original manuscript, which is conducive to the use and reading of the manuscript.

The present invention relates to the field of Internet technology, and discloses an encryption recommendation method, device, and terminal. The method includes: scanning user operations on terminal software, and updating the frequency of use of the software; according to the frequency of use of the software in the terminal, obtaining The commonly used software collection of the terminal; determine the recommended encrypted privacy software in the commonly used software collection according to the privacy weight and frequency of use of the software in the commonly used software collection; or include: scanning the user's use of the terminal software; judging the privacy of the software Whether the weight is greater than or equal to the preset privacy weight threshold; if the privacy weight of the software is greater than or equal to the preset privacy weight threshold, check whether the use of the software generates corresponding files in the software directory; The corresponding files are recommended as encrypted privacy files. Implementing the embodiments of the present invention can quickly and effectively recommend encrypted private files or private software to users.

The invention provides a processing method of a video frame stream, a video server and a terminal device. The processing method comprises the following steps of collecting, by the video server, a static menu image of each video frame in the video frame stream which is requested by the terminal device; coding the position, in the video frame stream, of the static menu image; carrying out fuzzy processing on the static menu image, so as to obtain a fuzzy image and a difference image; according to an encryption algorithm and an encryption key which are previously negotiated with the terminal device, encrypting the obtained difference image, and generating an encrypted file; transmitting the video frame stream of which the image is processed and the generated encrypted file to the terminal device. According to the processing method, the video server and the terminal device, which are provided by the invention, the static menu image of the video frame is subjected to the fuzzy processing to obtain the fuzzy image and the difference image; the difference image is encrypted; other persons are prevented from directly checking or obtaining a clear image of a video frame image; the effective encryption on a video is realized; the transmission safety of the video is improved.

This invention publishes a file encrypting method and apparatus, and a file decrypting method and apparatus. The file encrypting method includes the following steps: creating a virtual disk; the virtual disk receiving a writing request from a file system, encrypting data in the writing request; and notifying the file system to write the encrypted data into a corresponding physical disk, so that the file system writes the encrypted data into the corresponding physical disk after receiving a notification from the virtual disk. The methods and apparatuses provided by this invention employ the virtual disk to encrypt data in the writing request and decrypt the data required by the reading request, and this manner achieves highly-reliable, secure and effective file encrypting..

The invention provides an intelligent sharing financial platform and system based on a hash encryption algorithm and a quantum key, comprising: a middle station receives first financial data sent by a data sending terminal, and selects a corresponding financial data according to the type information of the first financial data The first hash encryption algorithm calculates the first financial data to obtain the first hash value; the middle station receives the quantum encryption public key sent by the quantum server, and encrypts the first financial data according to the quantum encryption public key to obtain For the second financial data, calculate the second financial data according to the second hash encryption algorithm to obtain a second hash value; the middle station combines the first hash value and the second hash value to obtain a first combined hash value value, the middle station calls the third hash encryption algorithm to calculate the first combined hash value to obtain the third hash value; the middle station calculates the third hash value according to the first hash value, the second hash value and the third hash value; A hash table is generated from the value, and the hash table and the second financial data are sent to the data receiving end.

The invention discloses an optical image encryption method for calculating ghost imaging by using a phase iterative algorithm, which comprises the following steps of: 1) performing collimation illumination on a laser beam, and sequentially inputting a group of different random phase masks into a spatial light modulator; wherein the wave is modulated by a pure phase mask, and the generated random speckle pattern passes through the object at the axial distance from the plane of the spatial light modulator; 2) wherein a transmission function T ([mu]m, v) of the object, Ii ([mu]m, v) = | Ei ([mu]m, v) | 2 being a speckle pattern, Ei ([mu]m, v) being a free space propagation field of the pure phase mask and (mu, v) representing lateral coordinates of the object plane; performing, for each purephase mask embedded in the spatial light modulator, by using Fresnel diffraction; and 3) correlating the intensity distribution collected by the barrel detector with the speckle pattern derived from the known pure phase mask. The method provided by the invention is simple and easy to implement and high in accuracy.

The invention provides an image encryption method and device. The method comprises the following steps: acquiring a Hash function value of a plaintext image, and acquiring a first key corresponding tothe plaintext image according to the Hash function value; performing sparse transformation processing on the plaintext image to obtain a discrete matrix corresponding to the plaintext image; performing scrambling processing on the discrete matrix through the first key to obtain a scrambled intermediate matrix, wherein the intermediate matrix corresponds to the scrambled plaintext image; and measuring the intermediate matrix by means of half-tensor compressed sensing, and outputting a first encrypted matrix, wherein the first encrypted matrix corresponds to the compressed and encrypted plaintext image. Through adoption of the method provided by the invention, the storage and transmission amounts of image data during transmission are reduced effectively.

The invention discloses a randomness analysis-based data encryption function detection method, which comprises the following steps of: (1) generating a detection sequence: dividing a data sequence to be detected into a plurality of data subsequences to be detected according to the set conditions; (2) executing randomness detection: aiming at each item in 16 items of 8 classes of a randomness testmethod, and respectively performing randomness detection on the plurality of data subsequences to be detected; and (3) analyzing detection results: in the process of executing all detection items, ifany data subsequence does not pass any item of the randomness detection, judging that the data sequence to be detected is a nonrandom sequence, namely the data to be detected is not encrypted, and ifthe data subsequences pass the detection of all detection items, judging that the data to be detected has been subjected to a certain degree of encryption processing. The randomness analysis-based data encryption function detection method has the advantages that the test method is novel, and test angles are comprehensive and cover a plurality of aspects of the data sequence randomness; and the statistic test principle is adopted for detection, so the operation is simple and convenient and that whether the data is encrypted in an information system can be effectively and accurately judged.

The invention relates to an encrypted U disk and an authorization method, wherein the encrypted U disk includes a USB interface for receiving data to be encrypted transmitted by a host; a detection unit for detecting the amount of data to be encrypted; a buffer, the buffer includes a The first address list, the second address list, the third address list and the fourth address list set up next time, the data storage area is used to store the encrypted data; the central control unit is connected with the detection unit, the buffer and the data respectively The storage areas are respectively connected to select corresponding encryption rules from the buffer area according to the detection results of the detection unit, encrypt the data to be encrypted and store it in the data storage area. By partitioning the addresses in the cache area, the encryption rules in different address partitions are selected according to the actual data volume to encrypt the data to be encrypted, making the data encryption more intelligent, and realizing the storage speed and speed of data storage. Storage security is double guaranteed.