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Information Theoretic Bounds on Authentication Systems in Query Model

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2 Author(s)
Safavi-Naini, R. ; Sch. of Inf. Technol. & Comput. Sci., Wollongong Univ., Wollongong, NSW ; Wild, P.R.

Authentication codes provide message integrity guarantees in an information theoretic sense within a symmetric key setting. Information theoretic bounds on the success probability of an adversary who has access to previously authenticated messages have been derived by Simmons and Rosenbaum, among others. In this paper, we consider a strong attack scenario where the adversary is adaptive and has access to authentication and verification oracles. We derive information theoretic bounds on the success probability of the adversary and on the key size of the code. This brings the study of unconditionally secure authentication systems on a par with the study of computationally secure ones. We characterize the codes that meet these bounds and compare our result with the earlier ones.

Published in:

Information Theory, IEEE Transactions on  (Volume:54 ,  Issue: 6 )

Date of Publication:

June 2008

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