Key-Private Proxy Re-Encryption from Lattices, Revisited

Ryo NISHIMAKI  Keita XAGAWA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A   No.1   pp.100-116
Publication Date: 2015/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.100
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Based Cryptography
Keyword: 
proxy re-encryption,  key privacy,  anonymity,  lattices,  

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Summary: 
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.