Abstract
The spatiotemporal chaotic system has good cryptographic properties,while the efficiency of the existing pseudorandom number generators based on this model is low. A new scheme to generate pseudorandom numbers with high efficiency based on a spatiotemporal chaotic system was proposed. In the process of generating pseudorandom numbers,the time-consuming operations were replaced by some fast ones and the iteration of the spatiotemporal chaotic system was reduced as possible,which made the generator own faster speed. The cryptographic performance of the pseudorandom sequences generated by this scheme was tested. The results show that the proposed scheme not only owns fast running speed and good cryptographic properties,but also has good cryptographic properties.
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