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The 3D chaotic system, the algorithm is very complex, the operation speed is slower than one dimension mapping, but it has a large key space and high security. The improved DES algorithm proposed in this paper can take into account the security of the algorithm, the operation speed and the realization of the algorithm. In order to achieve the highest level of security, we must be able to make the complexity of time and space is relatively small, the key space is relatively large, and can overcome the inherent shortcomings of DES algorithm.

Research on medical image encryption based on DES algorithm