On the security of TLS renegotiation
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
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Recently, a previously unknown, and not particularly complex, man-in-the-middle attack appeared, affecting all versions of the Transport Layer Security (TLS) protocol. TLS and its predecessors have been in widespread use for more than a decade and have been subject to detailed scrutiny from the security community over that period. Because TLS was also developed in a very open environment (the IETF), as is usually recommended by security professionals, the question arises: Why didn't we spot this sooner? In this article, the author outlines the new attack and ponders this question.