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MultiMedia is growing application in various areas ,security is an important issue in communication and storage of images and Encryption is a very common technique to uphold image security. Many encryption systems have been introduced among them; image encryption using chaotic sequence has many proposals. In this paper we analyze the security weakness of the proposal. We use chosen plain-text attack and known plain-text attack to reveal the secret parameters of the algorithm. That is to say, this method is not at all secure from the point of cryptography.

Image encryption using chaotic sequence and its cryptanalysis