367results about How to "Improve encryption efficiency" patented technology

The present invention discloses a file encryption method and an electronic device. The method comprises: after determining a to-be-encrypted file, randomly dividing the to-be-encrypted file into at least two data blocks; then randomly selecting all or a part of the data blocks, and randomly selecting one encryption key from a key library for each data block to perform encryption to obtain an encrypted block; and then generating an encrypted file according to starting locations and ending locations of the data blocks and/or the encrypted blocks. According to the file encryption method and the electronic device provided by the present invention, the whole to-be-encrypted file is divided, thereby increasing the encryption efficiency; and during encryption, selection of the data blocks and selection of the encryption key are both random, so that the secrecy of the encrypted file is improved, the decryption difficulty is increased, and the security of the encrypted file is ensured.

The invention discloses an encryption and decryption method for numeric type data. The method comprises the following steps that the numeric type data is converted into character strings; each character is sequentially converted into 4 bits according to the correspondence relationship between the numeric characters and the binary system, and a bit stream is formed; the number of 0 and 1 in the bit stream is counted, and an encryption secret key is obtained through calculation; the encryption secret key is utilized, a chaotic sequence with the pseudo-random property is generated by a chaotic system, in addition, chaotic signals are taken from the chaotic sequence and are sequenced in an ascending sequence, and the bit stream is scrambled according to the positions in accordance with the scrambling rule; the corresponding relationship between the four-digit binary coding mode and the visible ciphertext characters is utilized for converting the scrambled bit stream into the visible ciphertext character strings, and the ciphertext can be decrypted and recovered into the original data type data through adopting the similar method. According to the method provided by the invention, the corresponding table customization is adopted, the numeric type data is subjected to binary scrambling chaotic encryption processing, the safety and the feasibility of the data encryption are ensured, and in addition, the encryption efficiency is also greatly improved.

The invention discloses a novel vector encryption authentication mechanism and relates to a vector cryptography method, belonging to the technical field of information security. The method comprises the following steps: a cipher system selects a large number encryption key space M which is twice divided into 2*2 encryption key subspaces which are provided with 2 vectors with different orientations in order that each cipher system of the system possesses a unique encryption key subspace and a unique decryption key subspace; according to the method, the novel vector encryption authentication mechanism can be constructed; the mechanism adopts a hardware tamperproof encryption key generation/regeneration technology to realize the secondary division of the large number encryption key space and endow the encryption key with vector property; and the mechanism adopts a dissymmetrical symmetric algorithm array for encryption/decryption, thereby realizing high strength security, anti-replay, integral control, identity authentication and digital signature and having no problem of the management of the encryption key.

The invention discloses a mirror image backup/recovery method and tool of a web management mode. A mirror image backup/recovery file is stored in a privacy box created by a server. The mirror image backup/recovery method comprises the following steps of: creating tasks on an interface of a client and backs up the tasks into the privacy box; indicating a user to log in a storage server and open the privacy box; enabling the user to log in a configuration webpage of the privacy box of the server; and opening the corresponding privacy box distributed to the user, wherein virtual disk equipment is mounted to be used as the privacy box for storage. The tool comprises a backup guide, a task manager, the privacy box, a recovery manager, a timing manager, a mail reporter, a short message reporter, system resources, a superior network manager, historical logs and a client remote storage server disk information acquisition module. By a privacy box encryption technology, the backup transmission efficiency cannot be influenced and overmuch resources of the storage server cannot be consumed; therefore, the data encryption storage is realized under the condition that any backup efficiency is not influenced.

The invention provides a communication method based on a mobile application, a server and a client. The method comprises the following steps: receiving a current session key acquisition request sent by the client, wherein the current session key acquisition request comprises a first encrypted ciphertext, and the first encrypted ciphertext is generated by the client by using a RSA encryption algorithm to encrypt a randomly generated first encryption factor; generating a current session key according to the first encrypted ciphertext and a randomly generated second encryption factor; using an AES encryption algorithm to encrypt the current session key to generate a ciphertext of the current session key; and sending current session key acquisition response to the client, wherein the current session key acquisition response comprises the ciphertext of the current session key, so that after decrypting the ciphertext of the current session key, during the current session, the client uses the current session key as a symmetric key, uses a preset value as a vector and uses the AES encryption algorithm to encrypt a request message needing to be encrypted.

The invention provides a hyper-spectral image compression and encryption method. The method comprises the following steps of performing coding in a wavelet transform three-dimensional set partitioning in hierarchical trees (3DSPIHT) coding way, simultaneously performing encryption, constructing a scrambling table in a Logistic mapping way to scramble an initial list of insignificant pixels (LIP), continuously iterating a Chen's model until all bits of data of significant types are encrypted, and in a decryption process which is the inverse operation of encryption, continuously updating an initial value of the Chen's model to decrypt the data of the significant types to make the decrypted data gradually approximate to an original image and finally reproduce the original image. According to the method, forward dependence of a 3DSPIHT coding method is utilized, and the data of the significant types is selectively encrypted in real time in a compression process, so that the encrypted data volume of the image is reduced, and the image transmission and encryption efficiency is improved; and the encrypted data volume of each significant type in a bit plane is calculated, and an initial key is scrambled after preprocessing, so that the sensitivity of the coding method to a plaintext is improved.

The invention provides an implementation method for a specific security terminal system based on an iOS system, which is suitable for WiFi/3G/4G networks and comprises eight modules including an iOS user registration module, an iOS calling module, a client voice processing module, a request processing module, a parallel processing module, a user management module, a server side call processing module and a server side voice encryption and decryption module, wherein a client of the specific security terminal firstly registers with a server and initiates a call based on a client-server (C-S) framework, the server carries out authentication on identity of the client, and after the authentication is successful, the server carries out corresponding encryption and decryption processing on call voice through identifying whether a calling party and a called party establish different call modes for the security terminal, so that the voice encryption transmission from the specific security terminal to the server side is guaranteed. The invention provides an efficient and convenient method, and the method only encrypts one side with the security requirement, so that the call efficiency and the practicability are improved.

The invention discloses a double color image encryption method based on DNA sequence operation and deformed coupled map lattices. The method comprises: utilizing a secret key and two color plaintext images to generate parameters and initial values of iterating the deformed coupled map lattices, and generating secret key streams of L1, L2, K1 and K2 and random numbers of d1, d2 and d3 through iteration; separating red, green and blue trichromatic components of the plaintext images, transforming the components into binary matrices, and recombining the six binary matrices to obtain recombination matrices of A and B, utilizing the secret key streams of L1 and L2 to carry out bit-level scrambling on the matrices of A and B, and dividing the same into six binary matrices; utilizing a DNA encoding rule and combining the random numbers of d1, d2 and d3 to transform the binary matrices into DNA matrices, and executing DNA addition, subtraction and exclusive OR operations; and utilizing a DNA decoding rule to transform the DNA matrix into decimal matrices, utilizing the secret key streams of K1 and K2 and the bitwise exclusive OR operation to change values of image pixels, and obtaining ciphertext images of C1 and C2. The method can encrypt the two plaintext images at the same time, and has the advantages of high security, good encryption effect, no information loss, fast encryption speed and the like.

The invention discloses a fingerprint feature template encrypted storage method and system of a mobile terminal. The method comprises the following steps: classifying fingerprint feature templates to obtain N sub-templates, wherein N is greater than or equal to 2 and each sub-template in the N sub-templates corresponds to fingerprint feature data of a different type; encrypting M sub-templates in the N sub-templates, wherein M is smaller than N; and storing the encrypted M sub-templates and the unencrypted sub-templates to a storage area. Compared with encrypting the whole fingerprint feature templates in the prior art, in the fingerprint feature template encrypted storage method, only partial sub-templates in the N sub-templates are encrypted, and therefore, the calculation amount is remarkably reduced under the premise that the data security is guaranteed, and the encryption efficiency is improved.

The invention provides an image encryption and decryption method based on probability interval division and dynamic probability events. The method comprises steps of during encryption, firstly mapping secret key parameters and SHA-1 values of to-be-encrypted images to different probability encryption sections; carrying out random screening on to-be-encrypted pixels based on the secret key parameters and the SHA-1 values; and executing and writing different probability encryption events into corresponding pixel positions according to the probability sections where the probability encryption events fall. In order to improve safety, an SHA-1 value remapping process is added for dividing the probability sections, screening the to-be-encrypted pixels and carrying out stochastic disturbance on encryption; and by adding an overall situation encryption process related to SHA-1 update values and user secret keys, performance of an image encryption algorithm is enhanced. The method also comprises steps of during decryption, firstly recovering encrypted parameters; then finishing overall decryption; and at last executing inverse decryption operation on randomly screened pixels. Compared with the prior art, different pixels and secret keys correspond to different encryption processes, so the method is highly safe.

The invention provides a multi-image encryption method based on DNA encoding and chaos, and belongs to the field of information encryption. For mass digital images generated in big data, not only doesthe security of image content need to be guaranteed, but also the high encryption efficiency is needed. Multi-image encryption has the high efficiency characteristic by serving as a novel multimediasecurity technology. Some existing multi-image encryption methods have the defects that the encryption efficiency and the security are low, and decrypted images are obviously distorted and unsatisfactory. According to the multi-image encryption method, multiple original images are encoded into a corresponding DNA sequence matrix. The DNA sequence matrix is scrambled by a chaotic sequence, and a DNA sequence diffusion operation is conducted on a scrambling result. Encrypted images are obtained through a DNA decoding operation. The multi-image encryption method based on DNA encoding and chaos isproposed to serve as the main innovation content. Experiment results show that the method has the excellent encryption effect and is high in security and suitable for practical image encryption application.

The invention relates to a video-encryption camera comprising a video acquisition module, a video pre-processing and encrypting module and a video storage module, wherein the video acquisition module is used for transmitting video data to the video pre-processing and encrypting module upon the completion of video acquisition; the video pre-processing and encrypting module is used for pre-processing each frame of video data, making calculations by calling a chaotic encryption system in the video storage module to generate chaotic sequences and further carrying out the XOR operations on the chaotic sequences and each frame of video data to encrypt the video data; and the video storage module is used for storing the encrypted video data on a real-time basis. Compared with the prior art, the invention encrypts the video data while acquiring and pre-processing the video data, and stores the encrypted video data in the video storage module on a real-time basis, thus avoiding the consequences that the raw video data are illegally stolen or falsified.

The invention discloses data encryption and decryption methods, which are used for locally encrypting data to improve encryption efficiency and realizing a corresponding decryption scheme. The data encryption method comprises the following steps of: receiving data in a data stream form; and in the process of receiving data, encrypting data corresponding to preset position information and length information, wherein the data to be encrypted is partial data in file data. The data decryption method comprises the following steps of: receiving data in a data stream form; and in the process of receiving the data, decrypting data corresponding to preset position information and length information, wherein the data to be decrypted is partial data in file data. The invention also discloses devices for implementing the methods.

The invention relates to a color image encryption method based on Latin square scrambling. Plaintext keys r1, g1 and b1 are calculated through utilization of R, G and B components of a color plaintextimage, an initial value and a parameter obtained through calculation based on the keys are substituted into a chaotic system, and three groups of chaotic sequences are generated; the chaotic sequences for scrambling and diffusion are selected through utilization of a chaotic sequence selection mechanism based on the plaintext and digital arrangement; and a final ciphertext image is obtained through adoption of a block scrambling policy based on a Latin square and the chaotic sequences, and diffusion operation based on the plaintext and a scrambled image. The encryption method is closely related to the plaintext, so the plaintext attack resistance is improved. The employed chaotic system is an improved chaotic system, a chaotic characteristic is good, the randomness is high and a key spaceis great, so a security level is further improved. A simulation result and safety analysis show that according to the encryption provided by the invention, an image complete encryption demand can besatisfied, the encryption efficiency is high, and the robustness is high.

The invention discloses a multiple-image encryption method based on DNA coding and chaos, belonging to the field of information encryption. The massive digital image produced in the large data age should not only ensure the security of the image content, but also have high encryption efficiency. As a new multimedia security technology, the multiple-image encryption has the characteristic of high efficiency. A number of multiple-image encryption methods in the prior art have low encryption efficiency, weak security and obvious distortion in decrypted images, which are difficult to satisfy. Themultiple-image encryption method based on the DNA coding and the chaos comprises the following steps: encoding a number of original images into corresponding DNA sequence matrices; disordering the DNAsequence matrices by means of the chaos sequence; performing the DNA sequence diffusion operation on the disordered results; and obtaining the encrypted image by the DNA decoding operation. The maininnovation is that the invention provides a multiple-image encryption method based on the DNA coding and the chaos. The experimental results show that the method has excellent encryption effect and high security, and is suitable for the practical application of image encryption.

The invention discloses an encryption method, an encryption apparatus, a decryption method, a decryption apparatus and a terminal. The encryption method comprises: using a first secret key cipher text as a secret key of a first symmetric encryption algorithm so as to encrypt a clear text by the first symmetric encryption algorithm to obtain a cipher text; acquiring an informative abstract of the clear text, using the informative abstract as an original text of a signature algorithm, and using a second secret key cipher text as a secret key of the signature algorithm so as to generate a digital signature by the signature algorithm; packaging the first secret key cipher text, the second secret key cipher text and the digital signature to form an original text of an asymmetric cryptographic algorithm, and using an acquired public key as a secret key of the asymmetric cryptographic algorithm so as to generate a secret key set by the asymmetric cryptographic algorithm; and sending the cipher text and the secret key set to the terminal. According to the technical scheme of the invention, the encryption method, the encryption apparatus, the decryption method, the decryption apparatus and the terminal can be simultaneously guaranteed to have the characteristics of high encryption efficiency, small system resource occupation and encrypted data safety when data is encrypted.

The invention discloses an implementation method of a lightweight block cipher algorithm Wheel, which comprises the following steps of: calculating the number of turns by utilizing an initial encryption key, and sequentially obtaining an intermediate key and a whitening key by utilizing the initial encryption key; wherein each round of operation is composed of an F function operation, an FF function operation and a bitwise exclusive OR operation, each round of operation is used for processing N sets of encrypted information, and N sets of encrypted information corresponding to each next roundof operation are output information of the previous round of operation; and finally, performing Sa replacement operation on the output data subjected to round operation to obtain output data, and performing round encryption operation on the output data and the low bit of the initial encryption key to obtain encrypted plaintext information. According to the method, the encryption security and efficiency are improved.