Key-Private Proxy Re-Encryption from Lattices, Revisited

Ryo NISHIMAKI; Keita XAGAWA

doi:10.1587/transfun.E98.A.100

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

Online ISSN : 1745-1337
Print ISSN : 0916-8508

Special Section on Cryptography and Information Security

Key-Private Proxy Re-Encryption from Lattices, Revisited

Ryo NISHIMAKI, Keita XAGAWA

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Keywords: proxy re-encryption, key privacy, anonymity, lattices

JOURNAL RESTRICTED ACCESS

2015 Volume E98.A Issue 1 Pages 100-116

DOI https://doi.org/10.1587/transfun.E98.A.100

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Abstract

We propose two unidirectional proxy re-encryption schemes from the LWE assumptions. The schemes enjoy key privacy defined by Ateniese, Benson, and Hohenberger (CT-RSA 2009), that is, a delegator and a delegatee of a re-encryption key are anonymous.

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