Abstract / truncated to 115 words (read the full abstract)

This work investigates the design of chaotic cryptosystems and attacks. Chaos properties like: the pseudo-random aspect of chaotic time series, the sensibility to initials conditions/parameters, the ergodicity, the complex dynamics of chaos, the spread spectrum of chaotic dynamics … make them suitable to use in cryptography issues. We have analysed many chaotic cryptosystems from 1989 until the present day, we have classified them and we have proposed two modifications on Baptista cryptosystem to improve its security, and a colour image cryptosystem based on spatiotemporal chaos. We have also proposed two rapid attacks on a class of spatiotemporal cryptosystems. We have also designed a secure chaos-based communication called RDM-DCSK. We have finally introduced a new watermarking ... toggle 5 keywords

chaos – cryptography – watermark – communications – cryptanalysis

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