Cryptology ePrint Archive: Report 2002/019

Scream: a software-efficient stream cipher

Shai Halevi and Don Coppersmith and Charanjit Jutla

Abstract: We report on the design of Scream, a new software-efficient stream cipher, which was designed to be a ``more secure SEAL''. Following SEAL, the design of Scream resembles in many ways a block-cipher design. The new cipher is roughly as fast as SEAL, but we believe that it offers a significantly higher security level. In the process of designing this cipher, we re-visit the SEAL design paradigm, exhibiting some tradeoffs and limitations.

Category / Keywords: secret-key cryptography / Stream ciphers, Block ciphers, Round functions, SEAL

Publication Info: A shorter version appears in the proceedings of FSE'02

Date: received 16 Feb 2002, last revised 5 Jun 2002

Contact author: shaih at watson ibm com

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Note: some typos in the pseudocode were corrected

Version: 20020605:203745 (All versions of this report)

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