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

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 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 an Internet of ships intelligent shore-based interaction device based on Beidou, and the device comprises an embedded-type main control board, an extended control board, a communication/positioning module, an AIS module, a ZigBee module, a sensor module, an RFID module, an internal control module, an encryption module, a power module, an external control module, a fingerprint recognition module, a DVR module, a multimedia module, a storage unit, an intelligent terminal system, a liquid crystal touch screen, and an interface module. The embedded-type main control board is connected with the extended control board. The power module is connected with the main control board and the extended control board. The communication/positioning module achieves interaction with shore-based equipment through a Beidou message or a 3G/GPRS signal. The device employs the technology of multimode positioning, the technology of sensing, the technology of wireless networking communication and the technology of safety encryption, achieves a function of inland river gate report, a function of visualized emergency command scheduling and a function of shipping electronic business, and prompts the building and development of inland river Internet of ships.

The invention provides a vehicle CAN bus encryption method. The method comprises the following steps: firstly performing IMMO authentication on T-box, wherein the T-box sends a message to a gateway through a bus CAN under the condition that the IMMO authentication is passed; performing hardware encryption and decryption on the message sent by the T-box through a HSM of the T-box and the HSM of thegateway, wherein the a message counter is arranged on the T-box to count the sent message, and the gateway detects the message counter; judging that the message is legal when the message conforms tothe set rule, and decrypting the message when the message is legal, and then sending the decrypted message to other CAN branches of the vehicle. The vehicle CAN bus encryption method provided by the invention has the advantages that the triple encryption method of IMMO authentication, the HSM hardware encryption and the message counter judgment is applied by adopting the way of combining the software encryption and hardware encryption, the security of the vehicle CAN bus is greatly improved, the Hacker intrusion is prevented, and the travelling security is improved.

The invention relates to communication encryption, in particular to a quantum key charging method of a communication terminal. The method comprises the steps that connection relationships among a charging terminal, a quantum random number generator, an exchange cipher machine and a cipher service platform are established; the cipher service platform initializes a security medium in a communication terminal through the exchange cipher machine and the charging terminal; the quantum random number generator generates a charging key, and the exchange cipher machine generates an encryption key to encrypt the charging key; the charging terminal obtains the charging key based on a key obtaining token, and the exchange cipher machine encrypts the encryption key through a card public key and returns a charging key ciphertext and an encryption key ciphertext to the charging terminal; and the charging terminal imports the charging key ciphertext and the encryption key ciphertext into the security medium, the security medium returns a charging result to the charging terminal, and the charging terminal finishes key charging of the security medium. According to the technical scheme provided by the invention, the defects that an application range is limited and a quantum key is likely to be stolen in a quantum key charging process can be effectively overcome.

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 a device and a method for generating a cipher code based on digital contents and a data encrypting method. The cipher code generating device comprises a memory component, a random number generating component, an arithmetic component, an input and output component and a main control component which is respectively connected with the memory component, the random number generating component, the arithmetic component and the input and output component so as to control the operation of the components. Randomness and safety of cipher code generating can be met and the data can be effectively encrypted by using the cipher code generating device and the cipher code generating method based on the cipher code generating device and the data encrypting method of the invention, thus guaranteeing the security of the digital contents and maintaining the security and reliability of the data communication.

The invention discloses a digital image encryption method, decryption method and system based on a chaotic system, and belongs to the field of chaotic image encryption, and the encryption method comprises the steps: taking a one-dimensional chaotic mapping as a seed mapping, introducing a multiplication operator and a modular operator, constructing a strong dynamic chaotic mapping, initializing a control parameter of strong dynamic chaotic mapping by using the hash value of the digital image to be encrypted and the encryption key; iterating the strong dynamic chaotic mapping for multiple times, extracting bits with a preset length from a chaotic state value obtained by each iteration to form a corresponding pseudo-random sequence, and diffusing image pixels of the digital image to be encrypted by using the pseudo-random sequence; and performing multiple iterations on the strong dynamic chaotic mapping again, converting a chaotic state value obtained by each iteration into an integer value in a set interval until a set number of different integer values are obtained, and performing scrambling operation on image pixels after diffusion processing to obtain a final encrypted image. And the digital image is encrypted safely and effectively.

The invention provides an intelligent sharing financial platform and system based on a Hash encryption algorithm and a quantum key, and the method comprises the steps: receiving first financial data transmitted by a data transmitting terminal through a middle platform, according to the type information of the first financial data, selecting a corresponding first Hash encryption algorithm to calculate the first financial data to obtain a first Hash value; the middle station receives the quantum encryption public key sent by the quantum server, encrypts the first financial data according to the quantum encryption public key to obtain second financial data, and calculates the second financial data according to a second Hash encryption algorithm to obtain a second Hash value; the middle table combines the first Hash value and the second Hash value to obtain a first combined Hash value, and calls a third Hash encryption algorithm to calculate the first combined Hash value to obtain a third Hash value; and the middle table generates a hash table according to the first hash value, the second hash value and the third hash value, and sends the hash table and the second financial data to a data receiving end.

A method for burning an encrypted DVD disc belongs to the technical field of electronic products. The method is novel and the working principle is clear. When pirates use software such as Nero to copy the entire disc of the encrypted disc, they encounter continuous data reading errors in the burnt area. causing replication to fail. When trying to copy encrypted files separately from the master disk, a parameter error occurs and the data cannot be read to other storage devices, so as to avoid further illegal copying. Since the customer's data is located outside the area corresponding to the encrypted directory, and the area burnt by this method will not damage the customer's data, the master disc formed through the above steps will not be affected in any way during normal use.