Abstract
We explore the problem of enciphering members of a finite set M where k = ∣M∣ is arbitrary (in particular, it need not be a power of two). We want to achieve this goal starting from a block cipher (which requires a message space of size N = 2n, for some n). We look at a few solutions to this problem, focusing on the case when M= [0, k - 1]. We see ciphers with arbitrary domains as a worthwhile primitive in its own right, and as a potentially useful one for making higher-level protocols.
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Black, J., Rogaway, P. (2002). Ciphers with Arbitrary Finite Domains. In: Preneel, B. (eds) Topics in Cryptology — CT-RSA 2002. CT-RSA 2002. Lecture Notes in Computer Science, vol 2271. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45760-7_9
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DOI: https://doi.org/10.1007/3-540-45760-7_9
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