This volume constitutes the strictly refereed post-workshop proceedings of the Fourth International Workshop on Fast Software Encryption, FSE'97, held in Haifa, Israel, in January 1997.
The 23 full papers presented were carefully selected from 44 submissions and revised for inclusion in the book. Also contained is a summary of a panel discussion. The papers are organized in sections on cryptanalysis, blockciphers, stream ciphers, message authentication codes, modes of operation, and fast software encryption. Particular emphasis is placed on applicability and implementation issues of fast cryptography.

?2 cryptanalysis of the SEAL encryption algorithm.- Partitioning cryptanalysis.- The interpolation attack on block ciphers.- Best differential characteristic search of FEAL.- New block encryption algorithm MISTY.- The design of the ICE encryption algorithm.- Advanced Encryption Standard.- TWOPRIME: A fast stream ciphering algorithm.- On nonlinear filter generators.- Chameleon - A new kind of stream cipher.- Improving linear cryptanalysis of LOKI91 by probabilistic counting method.- Cryptanalysis of Ladder-DES.- A family of trapdoor ciphers.- The block cipher Square.- XMX: A firmware-oriented block cipher based on modular multiplications.- MMH: Software message authentication in the Gbit/second rates.- Fast message authentication using efficient polynomial evaluation.- Reinventing the travois: Encryption/MAC in 30 ROM bytes.- All-or-nothing encryption and the package transform.- On the security of remotely keyed encryption.- Sliding encryption: A cryptographic tool for mobile agents.- Fast software encryption: Designing encryption algorithms for optimal software speed on the Intel Pentium processor.- A fast new DES implementation in software.- Optimizing a fast stream cipher for VLIW, SIMD, and superscalar processors.