A fast digital chaotic generator for secure communication

Shih Liang Chen*, Tingting Hwang, Shu-Ming Chang, Wen-Wei Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


In this paper, we propose a digitalized chaotic map, Variational Logistic Map (VLM), modified from classical logistic map to be used in secure communication. Compared with classical logistic map, VLM has large parameter space without windows and can be implemented at low hardware cost. Referring to statistical testing suites SP800-22 and TestU01, VLM with the proposed scrambling method can significantly improve the output complexity as compared with other logistic-map based generators and piecewise linear chaotic map. Experiments show that the throughput of a 32-bit VLM is up to 3200 Mbps in 0.18 μm process. Furthermore, a chaotic crypto scheme, Multi-VLM (MVLM), constructed by four 32-bit VLMs can generate an output sequence with a minimal length equal to 2 128 -1 by a 128-bit external key.

Original languageEnglish
Pages (from-to)3969-3987
Number of pages19
JournalInternational Journal of Bifurcation and Chaos
Issue number12
StatePublished - 1 Jan 2010


  • Chaotic secure system
  • digital communication
  • variational logistic map


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