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Paper: Improving Upon the TET Mode of Operation

Authors:
Palash Sarkar
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URL: http://eprint.iacr.org/2007/317
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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.
BibTeX
@misc{eprint-2007-13597,
  title={Improving Upon the TET Mode of Operation},
  booktitle={IACR Eprint archive},
  keywords={modes of operations, tweakable encryption, strong pseudo-random permutation, disk encryption},
  url={http://eprint.iacr.org/2007/317},
  note={ palash@isical.ac.in 13739 received 14 Aug 2007},
  author={Palash Sarkar},
  year=2007
}