Computer Science – Cryptography and Security
Scientific paper
2012-01-06
IJCSI International Journal of Computer Science Issues, Vol. 9, Issue 1, No 2, (2012) 449-456
Computer Science
Cryptography and Security
8 pages, 5 figures, Published in IJCSI International Journal of Computer Science Issues (January 2012)
Scientific paper
Cryptography is always very important in data origin authentications, entity authentication, data integrity and confidentiality. In recent years, a variety of chaotic cryptographic schemes have been proposed. These schemes have typical structure which performed the permutation and the diffusion stages, alternatively. The random number generators are intransitive in cryptographic schemes and be used in the diffusion functions of the image encryption for diffused pixels of plain image. In this paper, we propose a chaotic encryption scheme based on pseudorandom bit padding that the bits be generated by a novel logistic pseudorandom image algorithm. To evaluate the security of the cipher image of this scheme, the key space analysis, the correlation of two adjacent pixels and differential attack were performed. This scheme tries to improve the problem of failure of encryption such as small key space and level of security.
Ahadpour Sodeif
Arasteh-Fard Zahra
Sadra Yaser
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