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

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.

A hash function is applied to a prefix of a VIL input. The output is added to a suffix of the input. A block cipher is applied to results of the addition. An encryption function is performed on the prefix. The final output is the output of the block cipher and the encryption function. In a second encryption technique, a hash function is applied to an input, and the output of the hash function has first and second portions. A block cipher is applied to the second portion. The output of the block cipher is added to the first portion, and a second function is applied to the result of this first addition. The output of the second function is added to the second portion. An inverse hash function is then applied to the output of the first and second additions, creating an encrypted output.

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.

A method of elliptic curve encryption includes, (a) selecting an elliptic curve E_p (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 E_p (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 n_A (of about >=160 bit length); (e) generating a public key P_A (x,y) given by the formula P_A (x,y)=(n_A-G (x,y)) mod (p); (f) encrypting the input message MSG; (g) decrypting the ciphered text.

The invention discloses an encryption and decryption method and device applied to a programmable device. The encryption method comprises the following steps of according to the corresponding relationship of a preset character unit and a base unit and the corresponding relationship of the base unit and a multi-system data unit, coding data to be encrypted including the preset character unit into a multi-system sequence ciphertext, wherein the multi-system sequence ciphertext comprises at least one multi-system data unit; the character unit comprises at least one character; and the base unit comprises at least one DNA base; and storing or outputting the multi-system sequence ciphertext. The decryption method is matched with the encryption method. According to the invention, in combination with the DNA characteristics, the encryption and decryption technology extremely having the safety and the operability is provided; the method is free from constraint of a secret key; users don't have to worry about that the secret key is stolen any longer; the users can customize the two corresponding relationships; different requirements of the users to safety levels are really realized; the matrix row and column alternative time is reduced; and thus, the encryption time is shortened.

The invention provides an encryption method of fingerprint image data, for providing a novel scheme for performing rapid encryption on fingerprint image big data and a 3DES algorithm. The method comprises the following steps: obtaining a digital sequence to be encrypted by performing binary conversion processing on original fingerprint image data; obtaining a cipher table by encrypting 256 combinations which may be composed of digits to be encrypted by use of a preset secret key; and performing grouping on the digital sequence to be encrypted by taking eight bytes as a unit, searching the cipher table for a password corresponding to each group, and obtaining an encryption result by splicing the passwords. The invention also simultaneously provides an encryption apparatus of fingerprint image data, for realizing the method. According to the technical scheme, when a large volume of fingerprint image data is encrypted by use of 3DES, the encryption time can be greatly shortened, and user experience is improved.

The invention discloses a color image encryption and decryption method and system based on double chaotic cross-diffusion. First, the parameters of Logistic and ChebyShev iterations are randomly generated, and then the initial key required for Logistic and ChebyShev iterations is input, and the transient state is eliminated by multiple iterations. Afterwards, Logistic and ChebyShev are used to iterate three times, and the results of the iterations are used as the initial keys for encryption, thereby actually increasing the key space. Then take the pixel in the picture, if the value corresponding to the pixel position is an odd number, use ChebyShev iteration to get the encryption key, otherwise use Logistic iteration to get the encryption key, so as to reduce the correlation between adjacent pixels. Then use the three channels of R, G, and B of this pixel to perform XOR operation with the R', G', and B' of the previous encrypted pixel to diffuse. The present invention reduces the number of iterations on the premise of ensuring safety, can reduce encryption time, and improves efficiency, and is especially suitable for image encryption of mobile devices such as mobile phones and tablet computers that require high real-time performance.

The invention discloses a safe data storage and transmission method. The safe data storage and transmission method comprises a data sender, a data receiver and a third party capable of communicating with the data sender and data receiver. The safe data storage and transmission method includes steps that A, the third party generates a symmetric key cache, encrypts and sends to the data sender; B, the data sender decodes the encrypted symmetric key, uses the decoded symmetric key to encrypt data to be transmitted, and transmits the encrypted data and a data receiver list to the third party; C, the third party uses a public key of each receiver to carry out conversion encryption treatment on the cached symmetric key according to the data receiver list and deletes the symmetric key; D, each data receiver receives the corresponding symmetric key performed with conversion encryption and the encrypted data from the third part, uses a private key thereof to decode the symmetric key performed with conversion encryption, and uses the decoded symmetric key to decode the encrypted data. The safe data storage and transmission method improves the data transmission efficiency and guarantees the data storage safety in the third party.

The embodiment of the invention provides a fast encryption method and device for an Android user partition and terminal equipment. The method comprises the steps that an encryption layer of the user partition of the Android terminal equipment is set up; a data distribution bitmap with a Block as a unit is set up for the user partition according to a file system in an inner core of the Android terminal equipment, wherein the data distribution bitmap is used for showing the use state of the Blocks in the user partition; the original data of the used Blocks in the user partition are read according to the data distribution bitmap; the original data of the Blocks are encrypted; the encrypted data of the Blocks are written back to the user partition, and cover the original data of the Blocks. According to the fast encryption method and device for the Android user partition and the terminal equipment, the user partition of the Android terminal equipment is encrypted through information, recorded by the file system of the Android terminal equipment, of the used data blocks, invalid data are prevented from being encrypted when the user data are encrypted, and therefore the effect of shortening the time spent in encrypting the partition is achieved.

The invention relates to a Paillier encryption method based on a cloud computing platform and belongs to the field of information security. The method is characterized in that Paillier encryption security is outsourced to a cloud server by adopting a security outsourcing algorithm based on modular exponentiation operation, so that a Paillier encryption person can protect encrypted information frombeing leaked, and Paillier encryption is efficiently carried out by utilizing computing power of the cloud server. The Paillier encryption method provided by the invention is applicable to security outsourcing and Paillier encryption in a cloud computing environment and is especially applicable to the situation that a user hopes to complete an encryption process by utilizing the cloud server andthe encrypted data cannot be leaked to the cloud server.

The invention discloses a file encryption method, a mobile terminal and a computer readable storage medium. The file encryption method comprises the following steps of obtaining a to-be-encrypted file in a file encryption request when the file encryption request triggered by outside is received; obtaining a virtual file of the to-be-encrypted file, and obtaining a file index of the to-be-encrypted file according to the virtual file; and performing encryption on the file index according to the preset encryption algorithm to obtain an encrypted file index, and storing the encrypted file index. The file encryption time is effectively shortened and the file encryption efficiency is improved.

The invention relates to a data encryption processing method and apparatus, an electronic device and a storage medium. The method comprises the steps of obtaining smart home data collected by a data collection apparatus; determining an encryption level corresponding to the smart home data based on data features extracted from the smart home data; selecting an encryption strategy corresponding to the smart home data according to the encryption strength and the encryption priority corresponding to the encryption level; and encrypting the smart home data by adopting the encryption strategy to obtain a data ciphertext. According to the technical scheme, based on the data type of the smart home data, the encryption strategy corresponding to the encryption strength and the encryption priority isselected for encryption. Thus, the security of important categories such as data related to user identity, privacy and other information is ensured, and for data with high real-time requirements, theencryption time of the data is shortened, and the transmission efficiency of the data is improved.

The invention discloses configuration methods and devices for a programmable device, identification information and programming data flow. A configuration method for the programmable device comprises the steps: inputting the programming data flow; reading identification information, which the programming data flow carries; reading identification information of the programmable device from a storage unit which is embedded in or externally connected with the programmable device; comparing the identification information, which the programming data flow carries, with the identification information of the programmable device; if the identification information, which the programming data flow carries, matches the identification information of the programmable device, configuring the programmable device according to the programming data flow. According to the configuration methods and devices for the programmable device, the identification information and the programming data flow, a problem that correspondence between the programming data flow and the programmable device cannot be achieved in the prior art is solved.

The invention discloses an image encryption method based on bit level scrambling and dynamic superposition diffusion and relates to the technical field of image encryption. The problem of contradiction between the existing image encryption efficiency and security is solved; the invention provides an image encryption method based on bit level scrambling and dynamic superposition diffusion. The method comprises an encryption process and a decryption process. In the scrambling process, a pixel plane is converted into a bit level plane; bit-level pixel scrambling is carried out on the basis of a bit-level plane, a dynamic superposition diffusion method is adopted for a diffusion part, superposition diffusion operation is carried out on pixels, diffusion efficiency is improved, encryption timeis greatly shortened, and a safe encryption effect is achieved under the condition that the operation speed is guaranteed.

The invention discloses a method and a device for configuring a programmable device, identification information and programming data flow. The method for configuring the programmable device comprises the following steps: importing programming data flow, reading identification information carried by the programming data flow, and reading the identification information of the programmable device from a nonvolatile storage unit embedded in or externally connected with the programmable device; comparing the identification information carried by the programming data flow with the identification information of the programmable device; and if the two is matched, configuring the programmable device according to the programming data flow. The method disclosed by the invention is used for solving the problem in the prior art that the programming data flow cannot correspond to the programmable device.