| Abdelfatah A. Tamimi and Ayman M. Abdalla
Department of Computer Science, Al-Zaytoonah University of Jordan,P.O. Box 130, Amman 11733, Jordan E-mail: drtamimi@ zuj.edu.jo, ayman@zuj.edu.jo |
Abstract - A new algorithm is presented for lossless image encryption using a private key. The image is regarded as a stream of bytes, and grouped into variable-length blocks whose sizes depend on the key. Circular shifting is applied to the bits in each block where the number of shifted bits depends on the key. Empirical analysis using different types of test images of different sizes showed that this new algorithm is effective and resistant to statistical attacks. The idea presented by this algorithm may be generalized to apply to input data other than images, and may be combined with other encryption methods.
Keywords: cryptography, stream cipher, block cipher.