Open AccessCryptanalysis and improvement of a class of hyperchaos based image encryption algorithms
Author(s) -
Congxu Zhu,
Kehui Sun
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
ISSN - 1000-3290
DOI - 10.7498/aps.61.120503
Subject(s) - encryption , plaintext aware encryption , computer science , deterministic encryption , cryptanalysis , plaintext , algorithm , multiple encryption , ciphertext , probabilistic encryption , ciphertext indistinguishability , watermarking attack , image (mathematics) , cryptography , class (philosophy) , attribute based encryption , theoretical computer science , computer security , public key cryptography , artificial intelligence
The security of a class of hyperchaotic image encryption algorithms is analysed. The results show that the shuffling process can be separated from the confusion process, and the formulas of encryption are simple, which makes the ciphertext cannot resist the attacks from chosen plaintext and ciphertext. Then we propose an improved and enhanced algorithm based on hyperchaos. The improved algorithm includes two rounds of encryption operation. The theoretical analyses and the experimental results indicate that the improved algorithm can overcome these flaws and has better cryptographic performances in resisting differential attacks and speed of encryption.