On the security of the digest function in the SARI image authentication system

Regunathan Radhakrishnan, Nasir Memon

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate the image authentication system SARI, proposed by Lin and Chang, that distinguishes JPEG compression from malicious manipulations. In particular, we look at the image digest component of this system. We show that if multiple images have been authenticated with the same secret key and the digests of these images are known to an attacker, Oscar, then he can cause arbitrary images to be authenticated with this same but unknown key. We show that the number of such images needed by Oscar to launch a successful attack is quite small, making the attack very practical. We then suggest possible solutions to enhance the security of this authentication system.

Original languageEnglish (US)
Pages (from-to)1030-1033
Number of pages4
JournalIEEE Transactions on Circuits and Systems for Video Technology
Issue number11
StatePublished - Nov 2002


  • Image authentication
  • Image digest functions
  • SARI
  • Salt

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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