Improving Upon the TET Mode of Operation

Palash Sarkar

Paper 2007/317

Improving Upon the TET Mode of Operation

Palash Sarkar

Abstract

Naor and Reingold had proposed the construction of a strong pseudo-random permutation (SPRP) by using a layer of ECB encryption between two layers of invertible block-wise universal hash functions. At Crypto 2007, Halevi presented constructions of invertible block-wise universal hash functions and a new mode of operation (called TET) based on them. In this paper, we present a new mode of operation called {\heh} using the Naor-Reingold approach. This is built using a new construction of invertible block-wise universal hash function. The new construction improves over Halevi's construction by removing restrictions on the hashing key. This in turn, leads to {\heh} improving over TET by allowing more efficient encryption and decryption of variable length messages as well as supporting better key agility. For the important application of disk encryption, we present a variant called {\hehfp} which has better key agility than TET.

Metadata

Available format(s): PDF
Publication info: Published elsewhere. Unknown where it was published
Keywords: modes of operations tweakable encryption strong pseudo-random permutation disk encryption
Contact author(s): palash @ isical ac in
History: 2007-08-16: received
Short URL: https://ia.cr/2007/317
License: CC BY

BibTeX

@misc{cryptoeprint:2007/317,
      author = {Palash Sarkar},
      title = {Improving Upon the {TET} Mode of Operation},
      howpublished = {Cryptology {ePrint} Archive, Paper 2007/317},
      year = {2007},
      url = {https://eprint.iacr.org/2007/317}
}