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Verifying secrets and relative secrecy

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Author
Volpano, Dennis
Smith, Geoffrey
Date
2000
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Abstract
Systems that authenticate a user based on a shared secret (such as a password or PIN) normally allows anyone to query whether the secret is a given value. For example, an ATM machine allows one to ask whether a string is the secret PIN of a (lost or stolen) ATM card. Yet such queries are prohibited in any model whose programs satisfy an information flow property like Noninterference. But there is a complexity-based justification for allowing these queries. A type system is given that provides the access control needed to prove that no well-tyoed program can leak secrets in polynomial time, or even leak them with nonnegligible probability if secrets are of sufficient length and randomly chosen. However, there are well-typed deterministic programs in a synchronous concurrent model capable of leaking secrets in linear time.
Description
The article of record as published may be located at http://dx.doi.org/10.1145/325694.325729
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/35902
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