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Stateful Public-Key Cryptosystems: How to Encrypt with One 160-bit Exponentiation
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Abstract: | We show how to significantly speed-up the encryption portion of some public-key cryptosystems by the simple expedient of allowing a sender to maintain state that is re-used across different encryptions. In particular we present stateful versions of the DHIES and Kurosawa-Desmedt schemes that each use only one exponentiation to encrypt, as opposed to two and three respectively in the original schemes, yielding the fastest discrete-log based public-key encryption schemes known in the random-oracle and standard models respectively. The schemes are proven to meet an appropriate extension of the standard definition of IND-CCA security that takes into account novel types of attacks possible in the stateful setting. |
BibTeX
@misc{eprint-2006-21759, title={Stateful Public-Key Cryptosystems: How to Encrypt with One 160-bit Exponentiation}, booktitle={IACR Eprint archive}, keywords={public-key cryptography /}, url={http://eprint.iacr.org/2006/267}, note={Preliminary version in ACM CCS 2006. This is the full version. mihir@cs.ucsd.edu 13372 received 12 Aug 2006, last revised 12 Aug 2006}, author={Mihir Bellare and Tadayoshi Kohno and Victor Shoup}, year=2006 }