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 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.

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 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.