## CryptoDB

### Paper: Timed-Release and Key-Insulated Public Key Encryption

Authors: Jung Hee Cheon Nicholas Hopper Yongdae Kim Ivan Osipkov URL: http://eprint.iacr.org/2004/231 Search ePrint Search Google In this paper we consider two security notions related to Identity Based Encryption: Key-insulated public key encryption, introduced by Dodis, Katz, Xu and Yung; and Timed-Release Public Key cryptography, introduced independently by May and Rivest, Shamir and Wagner. We first formalize the notion of secure timed-release public key encryption, and show that, despite several differences in its formulation, it is equivalent to strongly key-insulated public key encryption (with optimal threshold and random access key updates). Next, we introduce the concept of an authenticated timed-release cryptosystem, briefly consider generic constructions, and then give a construction based on a single primitive which is efficient and provably secure.
##### BibTeX
@misc{eprint-2004-12201,
title={Timed-Release and Key-Insulated Public Key Encryption},
booktitle={IACR Eprint archive},
keywords={timed-release, authenticated encryption, key-insulated encryption},
url={http://eprint.iacr.org/2004/231},
note={Financial Cryptography 2006 (extended version of) osipkov@cs.umn.edu 13342 received 9 Sep 2004, last revised 13 Jul 2006},
author={Jung Hee Cheon and Nicholas Hopper and Yongdae Kim and Ivan Osipkov},
year=2004
}