Digital realization of twisted tent map and ship map with LFSR as a pseudo-chaos generator

Analog chaotic circuits suffer from variation tolerance and electronic noise problems, where the robust digital implementations can eliminate these problems. From a complexity and security viewpoint, increasing the number of users in the communication systems is one of the most challenging problems. With the capability of generating a large number of distinct sequences, chaos is considered as an easy way to deal with the security issue. The use of 1-D chaotic signal for this goal is an expanding research field. This paper presents a digital implementation of chaotic signal generators with twisted tent map and ship map. The proposed approach is based on classic linear feedback shift register (LFSR). A piece-wise one-dimensional map such as ship map and twisted tent map are utilized. The chaotic signals are generated by synthesizable RTL HDL codes. Produced chaotic signals show d-like autocorrelation function. In terms of cryptographic properties results show that these signals have good chaotic behavior.