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Cryptography is always very important in data origin authentications, entityauthentication, data integrity and confidentiality. In recent years, a varietyof chaotic cryptographic schemes have been proposed. These schemes have typicalstructure which performed the permutation and the diffusion stages,alternatively. The random number generators are intransitive in cryptographicschemes and be used in the diffusion functions of the image encryption fordiffused pixels of plain image. In this paper, we propose a chaotic encryptionscheme based on pseudorandom bit padding that the bits be generated by a novellogistic pseudorandom image algorithm. To evaluate the security of the cipherimage of this scheme, the key space analysis, the correlation of two adjacentpixels and differential attack were performed. This scheme tries to improve theproblem of failure of encryption such as small key space and level of security.

A Novel Chaotic Encryption Scheme based on Pseudorandom Bit Padding