Image encryption method based on motion vector

Abstract

The invention discloses an image encryption method based on a motion vector. The image encryption method comprises the steps of: carrying out point-by-point encryption on a residual matrix in a video compression coding process and a quantized value of a motion vector residual value as a plaintext based on DCT and quantization, so as to eliminate the time correlation and spatial correlation of the plaintext; and based on an elliptic curve encryption algorithm, optimizing an elliptic curve encryption formula, and mapping quantized values of an image residual matrix and a motion vector to an elliptic curve and encrypted, so that image information is effectively hidden, secret key burden is reduced while security is ensured, the encryption method has a powerful encryption advantage in equipment with limited resources, and secure transmission of images between equipment is realized; and taking an embedded DM8127 video processing system as a computing platform, and realizing stable acquisition of high-definition images, effective and rapid image computing, specific application of an elliptic curve encryption algorithm and image display of an IE browser. The image encryption method not only can realize secure transmission between two sets of equipment, but also is suitable for a large-scale secure transmission system of multiple equipment.

Description

technical field [0001] The invention belongs to the technical field of digital encryption and embedded systems, and in particular relates to an image encryption method based on motion vectors. Background technique [0002] The current encryption technology is mainly divided into two categories: symmetric encryption technology and asymmetric encryption technology. The encryption speed of the symmetric encryption technology is fast, but there is a disadvantage that the key is relatively large and it is not convenient for key management. This disadvantage not only affects the performance of the device but also reduces the security of the algorithm. As far as asymmetric encryption technology is concerned, it has superior performance in key management, makes up for the defects of symmetric encryption technology, and is suitable for protecting multi-user public network security. Among them, the elliptic curve encryption algorithm (ECC) is an asymmetric encryption method based on ...

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Problems solved by technology

[0004] The purpose of the present invention is to propose an image encryption method based on motion vectors in order to overcome the shortcomings of the encryption algorithm being too complicated and the key management difficult, taking the image security issue as the basic starting point

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