A proxy broadcast re-encryption for cloud data sharing

Affiliation of Author(s):计算机科学与技术学院/人工智能学院/软件学院

Journal:MULTIMEDIA TOOLS AND APPLICATIONS

Key Words:Proxy re-encryption Automatically re-encryption Proxy broadcast re-encryption Chosen-ciphertext secure

Abstract:Proxy re-encryption (PRE) enables a semi-trusted proxy to automatically convert a delegator's ciphertext to a delegate's ciphertext without learning anything about the underlying plaintext. PRE schemes have broad applications, such as cloud data sharing systems, distributed file systems, email forward systems and DRM systems. In this paper, we introduced a new notion of proxy broadcast re-encryption (PBRE). In a PBRE scheme, a delegator, Alice, can delegate the decryption right to a set of users at a time, which means that Alice's ciphertext can be broadcast re-encrypted. We propose a PBRE scheme and prove its security against a chosen-ciphertext attack (CCA) in the random oracle model under the decisional n-BDHE assumption. Furthermore, our scheme is collusion-resistant, which means the proxy cannot collude with a set of delegates to reveal the delegator's private key.

ISSN No.:1380-7501

Translation or Not:no

Date of Publication:2018-05-01

Co-author:Sun, Maosheng,Ge, Chunpeng,wangjiandong

Correspondence Author:Liming Fang

Date of Publication:2018-05-01