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Effort-release public-key encryption from cryptographic puzzles

Rangasamy, Jothi, Stebila, Douglas, Boyd, Colin, Gonzalez Nieto, Juan M., & Kuppusamy, Lakshmi (2012) Effort-release public-key encryption from cryptographic puzzles. Lecture Notes in Computer Science, 7372, pp. 194-207.

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Abstract

Timed-release cryptography addresses the problem of “sending messages into the future”: information is encrypted so that it can only be decrypted after a certain amount of time, either (a) with the help of a trusted third party time server, or (b) after a party performs the required number of sequential operations. We generalise the latter case to what we call effort-release public key encryption (ER-PKE), where only the party holding the private key corresponding to the public key can decrypt, and only after performing a certain amount of computation which may or may not be parallelisable. Effort-release PKE generalises both the sequential-operation-based timed-release encryption of Rivest, Shamir, and Wagner, and also the encapsulated key escrow techniques of Bellare and Goldwasser.

We give a generic construction for ER-PKE based on the use of moderately hard computational problems called puzzles. Our approach extends the KEM/DEM framework for public key encryption by introducing a difficulty notion for KEMs which results in effort-release PKE. When the puzzle used in our generic construction is non-parallelisable, we recover timed-release cryptography, with the addition that only the designated receiver (in the public key setting) can decrypt.

Impact and interest:

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ID Code: 51573
Item Type: Journal Article
Additional Information: Information Security and Privacy : 17th Australasian Conference, ACISP 2012, Wollongong, NSW, Australia, July 9-11, 2012. Proceedings
Keywords: Cryptographic puzzles, Difficulty, Timed release encryption, Key escrow
DOI: 10.1007/978-3-642-31448-3_15
ISSN: 0302-9743
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600)
Divisions: Current > QUT Faculties and Divisions > Chancellery
Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Springer
Deposited On: 12 Jul 2012 08:27
Last Modified: 24 Oct 2013 15:34

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