A single-channel color image encryption method based on chaos and phase retrieval process comprises a color image chaos scrambling and decomposition step, a pure phase extraction and modulation step and a chaos diffusion step. Combining fractional Fourier transform and paired Logistic chaotic mapping, an encrypted image has nonlinearity and randomness, security and convergence speed of an encryption system are raised, and the problem of slow convergence speed existing in a present encryption method is solved. Meanwhile, complexity of the color image encryption system is reduced, the system is simple, and operation is convenient.

Single-channel color image encryption method based on chaos and phase retrieval process

The invention discloses a chaotic image encryption method with a double-direction diffusion mechanism, and belongs to the field of image encryption According to the chaotic image encryption method with the double-direction diffusion mechanism, the scrambling process is remained unchanged, the diffusion process is composed of two independent diffusion stages with different directions, the effect of the traditional method can be achieved through the double-direction diffusion of a first wheel, and therefore efficiency of an encryption system is obviously improved According to the cryptology analysis and encryption speed testing, compared with the encryption speed of the traditional method, the encryption speed of the chaotic image encryption method with the double-direction diffusion mechanism is improved by 44 percents or so under the premise of the same safety

Chaotic image encryption method with double-direction diffusion mechanism

Hyper-chaos encryption method for weak password based on quantum cellular neural network

The invention is suitable for the technical field of information security, and provides an encryption method and an encryption device. An initial value of a chaotic mapping parameter is acquired, chaotic mapping is subjected to iteration according to the initial value to acquire a key, and a DES (Data Encryption Standard) encryption algorithm is adopted to encrypt data according to the key. By using the method, the technical problem of structuring a high quality synchronization key is solved, a large number of non-repetitive keys can be obtained, and the cipher text is not easy to crack.

Encryption method and device

The invention discloses a chaotic-encryption-based medical image share method which comprises a secret image breakdown step, a chaotic image encryption step, a chaotic image decryption step and a secret image recovery step. According to the invention, a threshold secret share scheme is utilized to divide an image into n shadow images, the chaos principle is utilized to encrypt the n shadow images, the encrypted shadow images have the statistical property of white noise, and the collected r shadow images are utilized to recover the secret image. The chaotic-encryption-based medical image share method facilitates data storage and transmission, ensures confidentiality and integrity of significant images, and has strong anti-attack capacity.

Chaotic-encryption-based medical image share method

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.

Weihong Meng

Papers

Digital image encryption method based on chaotic orbit perturbation