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Pro-SRCC: Proxy-based Scalable Revocation for Constant Ciphertext Length

Authors:
Zeya Umayya
Divyashikha Sethia

Keywords: PIRATTE; CP-ABE; ProSRCC

Abstract:
Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is a fine-grained encryption technique, which can provide selective access control. Although it is computationally expensive, it has been proved feasible on resource-constrained devices, such as mobile devices and Internet of Things (IoT) devices. We look into the use case of storing important information, such as health records or sensor information from such devices by the user locally or through direct selective access by various users based on their roles. It must protect the information from malicious users with the support of an efficient revocation scheme. It must provide uninterrupted access to the unrevoked users without re-encryption or redistribution of keys. In this paper, we review the Emura's constant ciphertext CP-ABE scheme, which offers the advantage of retaining constant-sized ciphertext on resource-constrained devices. We propose a novel scheme called Proxy-based Scalable Revocation for Constant Ciphertext Length (ProSRCC) to improve it for scalable revocation without re-encryption and re-distribution of keys. It uses a trusted proxy server for partial decryption and revocation of users. The paper presents ProSRCC's design and implementation on the Pairing-based cryptography (PBC) library and compares it with the Proxy based Immediate Revocation of ATTribute-based Encryption (PIRATTE) and Emura's constant length CP-ABE schemes. The results indicate that computation time for ProSRCC is least as compared to the other schemes. Hence, it is beneficial to encrypt information with ProSRCC and get constant-sized ciphertext, as well as support for scalable revocation especially on static and resource-constrained devices.

Pages: 58 to 66

Copyright: Copyright (c) IARIA, 2018

Publication date: September 16, 2018

Published in: conference

ISSN: 2162-2116

ISBN: 978-1-61208-661-3

Location: Venice, Italy

Dates: from September 16, 2018 to September 20, 2018