A chosen text attack on the modified cryptographic checksum algorithm of Cohen and Huang

  • Authors:
  • Bart Preneel;Antoon Bosselaers;René Govaerts;Joos Vandewalle

  • Affiliations:
  • -;-;-;-

  • Venue:
  • CRYPTO '89 Proceedings on Advances in cryptology
  • Year:
  • 1989

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Abstract

A critical analysis of the modified cryptographic checksum algorithm of Cohen and Huang points out some weaknesses in the scheme. We show how to exploit these weaknesses with a chosen text attack to derive the first bits of the key. This information suffices to manipulate blocks with a negligible chance of detection.