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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Cryptography Secure against Related-Key Attacks and Tampering
verfasst von : Mihir Bellare, David Cash, Rachel Miller
Erschienen in: Advances in Cryptology – ASIACRYPT 2011
Verlag: Springer Berlin Heidelberg
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We show how to leverage the RKA (Related-Key Attack) security of blockciphers to provide RKA security for a suite of high-level primitives. This motivates a more general theoretical question, namely, when is it possible to transfer RKA security from a primitive P
1
to a primitive P
2
? We provide both positive and negative answers. What emerges is a broad and high level picture of the way achievability of RKA security varies across primitives, showing, in particular, that some primitives resist “more” RKAs than others. A technical challenge was to achieve RKA security even for the practical classes of related-key deriving (RKD) functions underlying fault injection attacks that fail to satisfy the “claw-freeness” assumption made in previous works. We surmount this barrier for the first time based on the construction of PRGs that are not only RKA secure but satisfy a new notion of identity-collision-resistance.