Frontiers of Information Technology & Electronic Engineering
>> 2022,
Volume 23,
Issue 2
doi:
10.1631/FITEE.2000366
Identity-based threshold proxy re-encryption scheme from lattices and its applications
Affiliation(s): Key Laboratory of Network and Information Security, Engineering University of People's Armed Police, Xi'an 710086, China; MOE Key Laboratory of Computer Network and Information Security, Xidian University, Xi'an 710071, China; less
Received: 2020-07-21
Accepted: 2022-02-28
Available online: 2022-02-28
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Abstract
(TPRE) can prevent collusion between a single proxy and a delegatee from converting arbitrary files against the wishes of the delegator through multiple proxies, and can also provide normal services even when certain proxy servers are paralyzed or damaged. A non-interactive identity-based TPRE (IB-TPRE) scheme over is proposed which removes the public key certificates. To accomplish this scheme, Shamir‘s secret sharing is employed twice, which not only effectively hides the delegator‘s private key information, but also decentralizes the proxy power by splitting the re-encryption key. means that a combiner can detect a misbehaving proxy server that has sent an invalid transformed ciphertext share. This property is achieved by lattice-based fully homomorphic signatures. As a result, the whole scheme is thoroughly capable of resisting quantum attacks even when they are available. The security of the proposed scheme is based on the decisional learning with error hardness assumption in the standard model. Two typical application scenarios, including a file-sharing system based on a blockchain network and a robust key escrow system with threshold cryptography, are presented.
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