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Cryptography

Helix
Fast Encryption and Authentication
in a Single Cryptographic Primitive
Niels Ferguson 1 , Doug Whiting 2 , Bruce Schneier 3 , John Kelsey 4 , Stefan
Lucks 5 , and Tadayoshi Kohno 6
1
MacFergus, niels@ferguson.net
2
HiFn, dwhiting@hifn.com
3
Counterpane Internet Security, schneier@counterpane.com
4 kelsey.j@ix.netcom.com
5
Universit¨ at Mannheim, lucks@weisskugel.informatik.uni-mannheim.de
6
UCSD, tkohno@cs.ucsd.edu
Abstract. Helix is a high-speed stream cipher with a built-in MAC function-ality.
On a Pentium II CPU it is about twice as fast as Rijndael or Twofish,
and comparable in speed to RC4. The overhead per encrypted/authenticated
message is low, making it suitable for small messages. It is efficient in both
hardware and software, and with some pre-computation can effectively switch
keys on a per-message basis without additional overhead.
Keywords: Stream cipher, MAC, authentication, encryption.
1 Introduction
Securing data in transmission is the......


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Approximate Word Count: 546
Approximate Pages: 3 (250 words per double-spaced page)

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