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, 7372/2012, pp. 194-207.
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.
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|Item Type:||Journal Article|
|Keywords:||Cryptographic puzzles, Difficulty, Timed release encryption, Key escrow|
|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:||18 Jul 2012 10:27|
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