Cryptographic Role-Based Access Control, Reconsidered : WestminsterResearch

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Title	Cryptographic Role-Based Access Control, Reconsidered
Authors	Liu, B.
	Michalas, A.
	Warinschi, B.
Type	Conference paper
Abstract	A significant shortcoming of traditional access control mechanisms is their heavy reliance on reference monitors. Being single points of failure, monitors need to run in protected mode and have permanent online presence in order to handle all access requests. Cryptographic access control offers an alternative solution that provides better scalability and deployability. It relies on security guarantees of the underlying cryptographic primitives and the appropriate key distribution/management in the system. In order to rigorously study security guarantees that a cryptographic access control system can achieve, providing formal security definitions for the system is of great importance, since the security guarantee of the underlying cryptographic primitives cannot be directly translated into those of the system. In this paper, we follow the line of the existing studies on the cryptographic enforcement of Role-Based Access Control (RBAC). Inspired by the study focusing on the relation between the existing security definitions for such systems, we identify two types of attacks not described in the existing works. Therefore, we propose two new security definitions with the goal of appropriately modeling cryptographic enforcement of Role-Based Access Control policies and studying the relation between our new definitions and the existing ones. In addition, we show that the cost of supporting dynamic policy updates is inherently expensive by presenting two lower bounds for such systems that guarantee correctness and secure access.
Keywords	Applied Cryptography
	Cryptographic Access Control
Year	2022
Conference	16th International Conference on Provable and Practical Security (ProvSec’22)
Publisher	Springer
Accepted author manuscript	2022_ProvSec_Cryptographic_RBACReconsidered.pdf File Access Level Open (open metadata and files)
Published	07 Nov 2022
Journal	Lecture Notes in Computer Science
Journal citation	13600, pp. 282-289
Book title	ProvSec 2022: Provable and Practical Security
ISBN	9783031209161
	9783031209178
Digital Object Identifier (DOI)	https://doi.org/10.1007/978-3-031-20917-8_19

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Cryptographic Role-Based Access Control, Reconsidered

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