Large Key Sizes and the Security of Password-Based Cryptography

Kent D. Boklan

doi:10.4018/jisp.2009010105

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Large Key Sizes and the Security of Password-Based Cryptography

Kent D. Boklan

Source Title: International Journal of Information Security and Privacy (IJISP) 3(1)

DOI: 10.4018/jisp.2009010105

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Abstract

We expose a potential vulnerability in the common use of password-based cryptography. When employing a user-chosen password to generate cryptographic keys which themselves are larger than the digest size of the underlying hash function, a part of the resulting key is produced deterministically and this, in turn, may lead to an exploitable weakness.

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Large Key Sizes and the Security of Password-Based Cryptography

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