Title: Exclusion-intersection encryption

Authors: Sherman S.M. Chow; Siu-Ming Yiu

Addresses: Department of Combinatorics and Optimization, University of Waterloo, Ontario N2L 3G1, Canada. ' Department of Computer Science, University of Hong Kong, Pokfulam, Hong Kong

Abstract: We propose a new variant of identity-based encryption named as exclusion-intersection encryption: Intersection decryption keys (e.g., A ? B ? C) generated by a key generation centre can only be used to decrypt the ciphertext which is of all the specified groups| interests, its holders are excluded from decrypting when the documents are not targeted to all these groups (e.g., the key of A ? B ? C cannot decrypt the ciphertext targeted only to C). While recent advances in cryptographic techniques can support a more general access control policy, the private key size is often not a constant. We also present an online/offline variant.

Keywords: access control; applied cryptography; compact private key; data con?dentiality; exclusion-intersection encryption; IBE; identity-based encryption; online encryption; offline encryption; pairings; security.

DOI: 10.1504/IJSN.2011.043672

International Journal of Security and Networks, 2011 Vol.6 No.2/3, pp.136 - 146

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 15 Nov 2011 *

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