1. J. Meyer, F. Gadegast: Security mechanisms for Multimedia Data with the Example MPEG-1-Video. http://www.powerweb.de/mpeg/doc/seemeng.ps.gz, 1995
2. B. Schneier: Applied Cryptography. 2nd Edition, ISBN 0-471-11709-9, John Wiley, New York, 1996
3. National Bureau of Standards: Data Encryption Standard. FIPS 46, Government Printing Service, 1977
4. ETH Series in Information Processing;X. Lai,1992
5. W. Diffie, M.E. Hellmann: New Directions in Cryptography. IEEE Transactions on Information Theory, 6, pp. 644–654, 1976