Open Access

ARTICLE

Key-Private Identity-Based Proxy Re-Encryption

Chunpeng Ge^{1, *}, Jinyue Xia², Liming Fang¹

1 College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210000, China.
2 IBM, Research Triangle Park, North Carolina, 27709, USA.

* Corresponding Author: Chunpeng Ge. Email: .

Computers, Materials & Continua 2020, 63(2), 633-647. https://doi.org/10.32604/cmc.2020.06217

Received 25 January 2019; Accepted 14 July 2019; Issue published 01 May 2020

Abstract

An identity-based proxy re-encryption scheme (IB-PRE) allows a semi-trusted proxy to convert an encryption under one identity to another without revealing the underlying message. Due to the fact that the proxy was semi-trusted, it should place as little trust as necessary to allow it to perform the translations. In some applications such as distributed file system, it demands the adversary cannot identify the sender and recipient’s identities. However, none of the exiting IB-PRE schemes satisfy this requirement. In this work, we first define the security model of key-private IB-PRE. Finally, we propose the first key-private IB-PRE scheme. Our scheme is chosen plaintext secure (CPA) and collusion resistant in the standard model.

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Keywords

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