A digital image encryption method
An encryption method and digital image technology, applied in the computer field, can solve problems such as low security of cryptographic systems, inferior efficiency to one-dimensional systems, and low sequence complexity, and achieve large key space, low complexity, and strong correlation Reduced effect
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[0049] The present invention proposes a digital image encryption method based on a non-standard rational Bezier method. According to the inherent characteristics of the non-standard rational quadratic Bezier curve, a one-dimensional rational mapping function is proposed. When the three weight factors are selected within a certain range When the value is , the iterative function has chaotic characteristics and generates a chaotic sequence. This system not only retains the advantages of simple form and high encryption and decryption efficiency of one-dimensional chaotic system, but also has the characteristics of large key space of high-dimensional chaotic system or hybrid system (a total of 3 weight factors and 1 initial x value of 4 initial variable), the correlation between encrypted image pixels is low, and it can effectively prevent plaintext attack attempts, which has high security.
[0050] According to the theory of computer-aided geometric design (CAGD), rational quadra...
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