Paper 2014/281
WCFB: a tweakable wide block cipher
Andrey Jivsov
Abstract
We define a model for applications that process large data sets in a way that enables additional optimizations of encryption operations. We designed a new strong pseudo-random tweakable permutation, WCFB, to take advantage of identified characteristics. WCFB is built with only 2m+1 block cipher invocation for m cipherblocks and approximately 5m XOR operations. WCFB can benefit from commonly occurring plaintext, such as encryption of a 0^nm sector, and repeated operations on the same wide block. We prove the birthday-bound security of the mode, expressed in terms of the security of the underlying block cipher. A case analysis of disk block access requests by Windows 8.1 is provided.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- wide block encryption modePRPdisk encryptionlarge dataset encryption
- Contact author(s)
- crypto @ brainhub org
- History
- 2014-05-16: revised
- 2014-04-24: received
- See all versions
- Short URL
- https://ia.cr/2014/281
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2014/281,
author = {Andrey Jivsov},
title = {{WCFB}: a tweakable wide block cipher},
howpublished = {Cryptology {ePrint} Archive, Paper 2014/281},
year = {2014},
url = {https://eprint.iacr.org/2014/281}
}
