CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Description of a New Variable-Length Key, 64-bit Block Cipher (Blowfish)
Fast Software Encryption, Cambridge Security Workshop
A Software-Optimised Encryption Algorithm
Fast Software Encryption, Cambridge Security Workshop
Fish: A Fast Software Stream Cipher
Fast Software Encryption, Cambridge Security Workshop
A Bulk Data Encription Algorithm
Fast Software Encryption, Cambridge Security Workshop
Optimizing a Fast Stream Cipher for VLIW, SIMD, and Superscalar Processors
FSE '97 Proceedings of the 4th International Workshop on Fast Software Encryption
FSE '99 Proceedings of the 6th International Workshop on Fast Software Encryption
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We explore the problem of designing a stream cipher that is fast in software yet may be efficiently implemented in hardware. We show that a keystream generator built as a word-wide non-linear-feedback shift register can offer both a high degree of parallelism and the hardware simplicity and flexible security of an iterated design. WAKE-ROFB is shown to be an example of this topology. A modified non-linear mixing function is proposed for WAKE-ROFB which makes it better suited to hardware implementation. The high degree of parallelism allows efficient implementation on processors having instruction-level parallelism, and leads naturally to high-speed pipelined hardware implementations. The recommended variant runs at 340 Mbps on a 266MHz Pentium II and 270 Mbps on a 100MHz TriMedia VLIW CPU, while a 2000 gate hardware implementation of the same cipher achieves 200 Mbps from a 50MHz clock. A higher speed variant achieves 600 Mbps, 340 Mbps and 400 Mbps respectively with some loss of security, while needing slightly less hardware.