Cryptology ePrint Archive: Report 2006/306

Revisiting the Security Model for Timed-Release Public-Key Encryption with Pre-Open Capability

Alexander W. Dent and Qiang Tang

Abstract: In this paper we investigate a security model for Timed-Release Encryption schemes with Pre-Open Capability (TRE-PC schemes) proposed by Hwang, Yum, and Lee. Firstly, we show that the HYL model possesses a number of defects and fails to model some potentially practical security vulnerabilities faced by TRE-PC schemes. Secondly, we propose a new security model for TRE-PC schemes which models the securities against four kinds of attacker and avoids the defects of the HYL model. We also work out the complete relations among the security notions defined in the new model. Thirdly, we introduce the notion of TRE-PC-KEM, which is a special type of KEM, and show a way to construct a TRE-PC scheme using a TRE-PC-KEM and a DEM. Finally, we propose an instantiation of a TRE-PC-KEM and prove its security.

Category / Keywords: public-key cryptography / Encryption, Timed-release encryption

Publication Info: Summary of results accepted for publication in ISC 2007

Date: received 6 Sep 2006, last revised 28 Jun 2007

Contact author: a dent at rhul ac uk

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Version: 20070628:143930 (All versions of this report)

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