Paper 2003/148
A Tweakable Enciphering Mode
Shai Halevi and Phillip Rogaway
Abstract
We describe a block-cipher mode of operation, CMC, that turns an n-bit block cipher into a tweakable enciphering scheme that acts on strings of mn bits, where m>=2. When the underlying block cipher is secure in the sense of a strong pseudorandom permutation (PRP), our scheme is secure in the sense of tweakable, strong PRP. Such an object can be used to encipher the sectors of a disk, in-place, offering security as good as can be obtained in this setting. CMC makes a pass of CBC encryption, xors in a mask, and then makes a pass of CBC decryption; no universal hashing, nor any other non-trivial operation beyond the block-cipher calls, is employed. Besides proving the security of CMC we initiate a more general investigation of tweakable enciphering schemes, considering issues like the non-malleability of these objects.
Metadata
- Available format(s)
-
PDF
PS
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. CRYPTO'03, LNCS, vol. 2729, Springer-Verlag, 2003
- Keywords
- Block-cipher usagecryptographic standardsdisk encryptionmodes of operationprovable securitysector-level encryptionsymmetric encryption.
- Contact author(s)
- shaih @ watson ibm com
- History
- 2003-07-28: received
- Short URL
- https://ia.cr/2003/148
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2003/148,
author = {Shai Halevi and Phillip Rogaway},
title = {A Tweakable Enciphering Mode},
howpublished = {Cryptology {ePrint} Archive, Paper 2003/148},
year = {2003},
url = {https://eprint.iacr.org/2003/148}
}
