Welcome to the resource topic for 2013/157
Title:
The fragility of AES-GCM authentication algorithm
Authors: Shay Gueron, Vlad Krasnov
Abstract:A new implementation of the GHASH function has been recently committed to a Git version of OpenSSL, to speed up AES-GCM. We identified a bug in that implementation, and made sure it was quickly fixed before trickling into an official OpenSSL trunk. Here, we use this (already fixed) bug as a real example that demonstrates the fragility of AES-GCM’s authentication algorithm (GHASH). One might expect that incorrect MAC tag generation would only cause legitimate message-tag pairs to fail authentication (which is already a serious problem). However, since GHASH is a “polynomial evaluation” MAC, the bug can be exploited for actual message forgery.
ePrint: https://eprint.iacr.org/2013/157
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