关键词: 图像安全, 混沌加密, 已知明文攻击, 选择明文攻击

Abstract: Aiming to analyze the potential vulnerability of a recently proposed image scrambling algorithm based on Logistic chaotic sequence and bit exchange, this paper gave out the corresponding improving ideas and got rid of the flaw of the algorithm application. Through known-plaintext attack and chosen-plaintext attack, the equivalent keys of the algorithm could be easily recovered. Both theoretical analysis and computer simulation indicate that the proposed attacks can completely break this algorithm and cause damage.

Key words: Image security, chaotic encryption, known-plaintext attack, chosen-plaintext attack