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Function-Based Access Control

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Inspired by Functional Encryption, we introduce Function-Based Access Control (FBAC). From an abstract viewpoint, we suggest storing access authorizations as a three-dimensional tensor, or an Access Control Tensor (ACT) rather than the two-dimensional Access Control Matrix (ACM).

In FBAC , applications do not give blind folded execution right and can only invoke commands that have been authorized for function defined data segments. So, one might be authorized to use a certain command on one object, while being forbidden to use the same command on another object. Such behavior can not be efficiently modeled using the classical access control matrix or achieved efficiently using cryptographic mechanisms.


Yvo Desmedt is the Jonsson Distinguished Professor at the University of Texas at Dallas, a Honorary Professor at University College London, a Fellow of the International Association of Cryptologic Research (IACR) and a Member of the Belgium Royal Academy of Science. He received his Ph.D. (1984, Summa cum Laude) from the University of Leuven, Belgium.

He held positions at: Universite de Montreal, University of Wisconsin-Milwaukee (founding director of the Center for Cryptography, Computer and Network Security), and Florida State University (Director of the Laboratory of Security and Assurance in Information Technology, one of the first 14 NSA Centers of Excellence). He was BT Chair and Chair of Information Communication Technology at University College London. He has held numerous visiting appointments. He is the Editor-in-Chief of IET Information Security and Chair of the Steering Committees of CANS . He was Program Chair of e.g., Crypto 1994, the ACM Workshop on Scientific Aspectsof Cyber Terrorism 2002, and ISC 2013 .

He has authored over 200 refereed papers, primarily on cryptography, computer security, and network security. He has made important predictions, such as his 1983 technical description how cyber could be used to attack control systems (realized by Stuxnet), and his 1996 prediction hackers will target Certifying Authorities (DigiNotar was targeted in 2011).

This talk is part of the Computer Laboratory Security Seminar series.

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