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CTRSA
2011
Springer

Online Ciphers from Tweakable Blockciphers

7 years 9 months ago
Online Ciphers from Tweakable Blockciphers
Abstract. Online ciphers are deterministic length-preserving permutations EK : ({0, 1}n )+ → ({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. Key words: Online ciphers, modes of operation, provable security, symmetric encryption, tweakable blockciphers.
Phillip Rogaway, Haibin Zhang
Added 27 Aug 2011
Updated 27 Aug 2011
Type Journal
Year 2011
Where CTRSA
Authors Phillip Rogaway, Haibin Zhang
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