LEVIATHAN (cipher)

LEVIATHAN's tree-based keystream generation

LEVIATHAN is a stream cipher submitted to NESSIE by Scott Fluhrer and David McGrew. It is a seekable stream cipher, which means that the user may efficiently skip forward to any part of the keystream, much like CTR mode or Salsa20, but unlike those ciphers generating contiguous blocks of the keystream is made especially efficient by LEVIATHAN's unique tree structure based stream generation. LEVIATHAN achieves around 11 cycles per byte on a Pentium II processor.

LEVIATHAN is considered broken due to distinguishing attacks which require 2³⁶ bytes of output and comparable effort.^[1]

External links

LEVIATHAN specification (ZIP file) — link dead. Available from the Internet Archive

References

↑ Crowley, P.; Lucks, S. (April 2001). "Bias in the LEVIATHAN stream cipher". Fast Software Encryption: 8th International Workshop (Lecture Notes in Computer Science). Yokohama, Japan: Springer-Verlag. Retrieved 2006-11-13.

Stream ciphers

Widely used ciphers

eSTREAM Portfolio

Software	HC-256 Rabbit Salsa20 SOSEMANUK

Hardware	Grain MICKEY Trivium

Other ciphers

Theory

Attacks

Cryptography

History of cryptography Cryptanalysis Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

Category Portal WikiProject

This article is issued from Wikipedia - version of the 7/28/2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.