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        Gearing up : How to eat your cryptocake and still have it

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        Final Accepted Version (PDF, 163Kb)
        Author
        Shafarenko, A.
        Christianson, B.
        Attention
        2299/8052
        Abstract
        Often Alice and Bob share a fixed quantity of master key and subsequently need to agree a larger amount of session key material. At present, they are inclined to be cautious about generating too much session key material from a single master key. We argue that this caution arises from their familiarity with keys consisting of a few dozen bytes, and may be misplaced when keys consist of many billions of bytes. In particular, if the proof that the master key was securely distributed depends on a bounded-memory assumption for Moriarty, then the same assumption also imposes constraints upon the cryptanalysis which Moriarty can apply to the generated session material. Block ciphers with (effectively) Terabit blocks allow a much higher ratio of session to master key than can be countenanced with current key lengths, and we construct one such cypher.
        Publication date
        2011-01-01
        Published in
        Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
        Published version
        https://doi.org/10.1007/978-3-642-25867-1_24
        Other links
        http://hdl.handle.net/2299/8052
        Relations
        School of Computer Science
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