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ASIACRYPT
2015
Springer

An Inverse-Free Single-Keyed Tweakable Enciphering Scheme

7 years 11 months ago
An Inverse-Free Single-Keyed Tweakable Enciphering Scheme
In CRYPTO 2003, Halevi and Rogaway proposed CMC, a tweakable enciphering scheme (TES) based on a blockcipher. It requires two blockcipher keys and it is not inverse-free (i.e., the decryption algorithm uses the inverse (decryption) of the underlying blockcipher). We present here a new inverse-free, single-keyed TES. Our construction is a tweakable strong pseudorandom permutation (tsprp), i.e., it is secure against chosen-plaintext-ciphertext adversaries assuming that the underlying blockcipher is a pseudorandom permutation (prp), i.e., secure against chosen-plaintext adversaries. In comparison, sprp assumption of the blockcipher is required for the sprp security of CMC. Our scheme can be viewed as a mixture of type-1 and type-3 Feistel cipher and so we call it FMix or mixed-type Feistel cipher.
Ritam Bhaumik, Mridul Nandi
Added 16 Apr 2016
Updated 16 Apr 2016
Type Journal
Year 2015
Where ASIACRYPT
Authors Ritam Bhaumik, Mridul Nandi
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