Paper 2004/231
Timed-Release and Key-Insulated Public Key Encryption
Jung Hee Cheon, Nicholas Hopper, Yongdae Kim, and Ivan Osipkov
Abstract
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.
Note: Older working version of the paper is available at http://www.cs.umn.edu/~osipkov/eprint2005_231_old.pdf
Metadata
- Available format(s)
-
PDF
PS
- Publication info
- Published elsewhere. Financial Cryptography 2006 (extended version of)
- Keywords
- timed-releaseauthenticated encryptionkey-insulated encryption
- Contact author(s)
- osipkov @ cs umn edu
- History
- 2006-07-13: last of 14 revisions
- 2004-09-10: received
- See all versions
- Short URL
- https://ia.cr/2004/231
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2004/231,
author = {Jung Hee Cheon and Nicholas Hopper and Yongdae Kim and Ivan Osipkov},
title = {Timed-Release and Key-Insulated Public Key Encryption},
howpublished = {Cryptology {ePrint} Archive, Paper 2004/231},
year = {2004},
url = {https://eprint.iacr.org/2004/231}
}
