Lattice-based threshold-changeability for standard Shamir secret-sharing schemes

Steinfeld, Ron, Wang, Huaxiong, & Pieprzyk, Josef (2004) Lattice-based threshold-changeability for standard Shamir secret-sharing schemes. Lecture Notes in Computer Science : Advances in Cryptology - ASIACRYPT 2004, 3329, pp. 170-186.

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We consider the problem of increasing the threshold parameter of a secret-sharing scheme after the setup (share distribution) phase, without further communication between the dealer and the shareholders. Previous solutions to this problem require one to start off with a non-standard scheme designed specifically for this purpose, or to have communication between shareholders. In contrast, we show how to increase the threshold parameter of the standard Shamir secret-sharing scheme without communication between the shareholders. Our technique can thus be applied to existing Shamir schemes even if they were set up without consideration to future threshold increases.

Our method is a new positive cryptographic application for lattice reduction algorithms, inspired by recent work on lattice-based list decoding of Reed-Solomon codes with noise bounded in the Lee norm. We use fundamental results from the theory of lattices (Geometry of Numbers) to prove quantitative statements about the information-theoretic security of our construction. These lattice-based security proof techniques may be of independent interest.

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11 citations in Scopus
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11 citations in Web of Science®

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ID Code: 74259
Item Type: Journal Article
Refereed: Yes
DOI: 10.1007/978-3-540-30539-2_13
ISBN: 978-3-540-30539-2
ISSN: 1611-3349
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Jul 2014 03:28
Last Modified: 22 Jul 2014 23:13

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