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
Creative Commons Attribution
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},
      note = {\url{https://eprint.iacr.org/2014/281}},
      url = {https://eprint.iacr.org/2014/281}
}
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