1. M. Blaze, W. Diffie, R.L. Rivest, B. Schneier, T. Shimomura, E. Thompson, and M. Wiener. Minimal key lengths for symmetric ciphers to provide adequate commercial security. January 1996.
2. W. Diffie and M.E. Hellman. Exhaustive cryptanalysis of the NBS Data Encryption Standard. Computer, 10:74–84, June 1977.
3. Lect Notes Comput Sci;H. Eberle,1993
4. H. Eberle and C.P. Thacker. A 1 Gbit/second GaAs DES chip. In Proceedings of the IEEE 1992 Custom Integrated Circuits Conference, pages 19.7/1–4, New York, NY, USA, 1992. IEEE, IEEE.
5. G.M. Haskins. Securing Asynchronous Tranfer Mode networks. Masters thesis, Worcester Polytechnic Institute, Worcester, Massachusetts,USA, May 1997.