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.

Key words: pseudorandom-number generator, chaos, chaos-based cipher, stream cipher

摘要： 时空混沌系统有很好的密码学特性，但目前基于该模型提出的伪随机数发生器存在效率不高的问题。为此，提出了一种高效的基于时空混沌的伪随机数设计方案。在产生伪随机数的过程中，将一些耗时操作尽可能地替换为一些快速操作，并尽可能地减少时空混沌模型自身的迭代次数，因此算法的效率得到有效提升。对算法所产生的伪随机序列的密码学属性进行了测试，结果表明该伪随机发生器方案不仅运算速度快，而且具有很好的密码学性能。

关键词: 伪随机数发生器, 混沌, 混沌密码, 流密码