41results about How to "Reduce encryption time" patented technology

A method of elliptic curve encryption includes, (a) selecting an elliptic curve Ep (a,b) of the form y2=x3+ax+b mod (p) wherein a and b are non-negative integers less than p satisfying the formula 4 a3+27b2 mod (p) not equal to 0; (b) generating a large 160 bit random number by a method of concatenation of a number of smaller random numbers; (c) generating a well hidden point G (x,y) on the elliptic curve Ep (a,b) by scalar multiplication of a point B (x,y) on the elliptic curve with a large random integer which further includes the steps: (i) converting the large random integer into a series of powers of 231; (ii) converting each coefficient of 231 obtained from above step into a binary series; (iii) multiplication of binary series obtained from steps (i) and (ii) above with the point B (x,y) on the elliptic curve; (d) generating a private key nA (of about >=160 bit length); (e) generating a public key PA (x,y) given by the formula PA (x,y)=(nA−G (x,y)) mod (p); (f) encrypting the input message MSG; (g) decrypting the ciphered text.

The invention relates to a color image encryption method based on an SHA-384 function, a spatiotemporal chaotic system, a quantum chaotic system and a neural network. The method includes the steps that an original color image I0 is calculated through the SHA-384 function, a Hash value is obtained as a secret key, the Hash value, a CML and one-dimension Logistic chaotic mapping are utilized for generating a chaos sequence, bit-level line-column scrambling is carried out on high four-digit images of components of three primary colors of the I0 through the chaos sequence, and a scrambled image I1 is obtained; the Logistic quantum chaotic system is utilized for generating a chaos sequence for encrypting the scrambled image, and is combined with the neural network to carry out parallel diffusion processing on all pixel values of components of three primary colors of the I1, and a final encrypted image I2 is obtained. By the method, the space of the secret key is greatly enlarged, the safety, encryption effect and secret key sensibility are higher, the attack resistance capacity is higher, the scrambling process and the encryption time are shorter, and hardware implementation is easier.

The invention provides an indoor positioning method for efficient privacy protection based on Wi-Fi fingerprint. The indoor positioning method comprises the following steps: at first, collecting the fingerprint of each position indoors and generating an index set; and then, transmitting the index set to a client through a wireless network, for enabling a user to look up the position information per se, wherein the fingerprint refers to a RSS signal of each position corresponding to each Wi-Fi access point, and the index set comprises multiple hash tables, parameters of a corresponding function group of each hash table and a position coordinate of each fingerprint marked by a fingerprint serial number. According to the indoor positioning method provided by the invention, a method of using a position sensitive hash function to encrypt position privacy is adopted to achieve high efficiency and privacy protection properties. The positioning is redesigned to achieve the purposes of reducing the computing time and space, improving the positioning precision and protecting the privacy of the position information of a user and a server.

The image encryption method based on bit-level scrambling and network diffusion relates to the field of image encryption technology and solves the problem of conflicting existing image encryption efficiency and security. The image encryption method based on bit-level scrambling and network diffusion proposed by the present invention, The scrambling process converts the pixel plane into a bit-level plane, and performs bit-level pixel scrambling on the basis of the bit-level plane. The diffusion part uses the "simplified Feistel network" diffusion method to perform diffusion operations on pixels, which improves the diffusion efficiency and greatly The encryption time is reduced, and the safe encryption effect is achieved while ensuring the operation speed.

The invention discloses an intelligent cloud platform face recognition and local encryption method based on a neural network. The method comprises the steps of processing an original image through animage pyramid; establishing a face / non-face classifier, and outputting a large number of results which may be face classification, boundary frame regression and face position; carrying out bounding box regression, refining the candidate windows, and discarding a large number of overlapped windows; carrying out landmark positioning, removing a candidate window and displaying five face key point positioning at the same time; and encrypting the data through a chaotic logic diagram and an RC4 stream password. A local encryption mode is adopted, so that the picture encryption time is shortened, andthe encryption efficiency is greatly improved.

The embodiment of the invention discloses an encryption method comprising steps of: obtaining the unencrypted ith data block in a first file, wherein the first file is a temporary file into which the data of a file to be downloaded is being written during a downloading process, the ith data block is continuous data not beyond a first preset range in the file to be downloaded, and i is greater than or equal to 1; encrypting the i-th data block; writing the encrypted ith data block into a second file; and ending the encryption process when the first file does not have unencrypted (i+1)th data block. The embodiment of the present invention also discloses an encryption apparatus.

The image encryption method based on bit-level scrambling and dynamic superposition and diffusion relates to the field of image encryption technology and solves the problem of conflicting efficiency and security of existing image encryption. The image encryption based on bit-level scrambling and dynamic superposition and diffusion proposed by the present invention The method includes an encryption process and a decryption process. In the scrambling process of the present invention, the pixel plane is converted into a bit-level plane, and bit-level pixel scrambling is performed on the basis of the bit-level plane. The overlapping diffusion operation improves the diffusion efficiency, greatly reduces the encryption time, and achieves a safe encryption effect while ensuring the operation speed.

The invention relates to a chaos image encryption method based on dual scrambling and DNA coding, firstly, carrying out bit plane decomposition on a plaintext image and carrying out DNA coding and transformation on the image to turn the image into a three-dimensional DNA matrix; then, scrambling the three-dimensional DNA matrix through the dual scrambling operation, wherein the sequence of the chaotic sequences is scrambled and the DNA sequence is scrambled in a bit level through combining the three-dimensional cat mapping; next, performing diffusion operation on the scrambled three-dimensional DNA matrix, and converting the diffused matrix into a two-dimensional DNA matrix; finally, performing decoding operation on the two-dimensional DNA matrix to obtain a ciphertext image. According tothe invention, the SHA256 hash function of the plaintext image is used to calculate the initial value of the chaotic system, and the parameters of three-dimensional cat mapping are also related to theplaintext image, which enhances the ability of the algorithm to resist the selection of plaintext attack. Experimental results and safety analysis show that the encryption scheme can resist various known attacks, and can effectively protect the security of images and also can improve the security level.

This application discloses a cloud storage encryption, decryption and verification method and system, which is applied to a data upload terminal, including: generating temporary ciphertext in advance using the encryption parameters used for encryption in the system public parameters; using the system public parameters for verification Complete data verification parameters, temporary ciphertext, plaintext data, and access structure to generate outsourced ciphertext; send outsourced ciphertext to the cloud server; this application pre-uses system public parameters for encryption when the data upload terminal has sufficient energy The encryption parameters are used to generate temporary ciphertext, and the part of the encryption process that consumes too much energy in the encryption process using the system public parameters for encryption is preprocessed in advance, so that even in the case of insufficient energy, the amount of calculation when encrypting data is reduced. And energy consumption, you can directly use the temporary ciphertext, verification parameters, plaintext data and access structure to generate outsourced ciphertext, shorten the encryption time, and reduce the amount of calculation and energy consumption.

The invention relates to a digital image encryption method based on chaotic orbit perturbation and relates to the field of encryption systems. The method comprises the following steps of: scrambling a plaintext image by adopting a generalized discrete Baker mapping-based method; diffusing the scrambled image by adopting a Logistic mapping-based method, and changing the pixel value of each point in the image; and performing multiple encryption according to the requirement on encryption strength. According to the method, a key flow is related to a key and a plaintext by introducing a chaotic orbit perturbation mechanism related to the plaintext, so that the diffusing effects of an encryption system are effectively improved, and the known plaintext resistance is obviously improved. Certain pixel value is changed in the diffusion process depending on the cumulative effect of all the encrypted pixel values before the pixel, so that the tiny change of one pixel value can be effectively diffused to all the subsequent pixels in the image. The method has short encryption time.