Abstract
Online ciphers are deterministic length-preserving permutations \({\mathcal E}_K : (\{0. 1\}^n)^+\rightarrow(\{0. 1\}^n)^+\) where the i-th block of ciphertext depends only on the first i blocks of plaintext. Definitions, constructions, and applications for these objects were first given by Bellare, Boldyreva, Knudsen, and Namprempre. We simplify and generalize their work, showing that online ciphers are rather trivially constructed from tweakable blockciphers, a notion of Liskov, Rivest, and Wagner. We go on to show how to define and achieve online ciphers for settings in which messages need not be a multiple of n bits.
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Rogaway, P., Zhang, H. (2011). Online Ciphers from Tweakable Blockciphers. In: Kiayias, A. (eds) Topics in Cryptology – CT-RSA 2011. CT-RSA 2011. Lecture Notes in Computer Science, vol 6558. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19074-2_16
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DOI: https://doi.org/10.1007/978-3-642-19074-2_16
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