Paper 2006/267 Original: eprint.iacr.org/2006/267 ↗
Stateful Public-Key Cryptosystems: How to Encrypt with One 160-bit Exponentiation
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.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2006-08-12: last updated
- 2006-08-12: published
- Short URL
- https://ia.cr/2006/267
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2006/267,
author = {Mihir Bellare and Tadayoshi Kohno and Victor Shoup},
title = {Stateful Public-Key Cryptosystems: How to Encrypt with One 160-bit Exponentiation},
howpublished = {Cryptology {ePrint} Archive, Paper 2006/267},
year = {2006},
url = {https://eprint.iacr.org/2006/267}
}