Defending against Fake VIP in Scant-Transparency Information Systems with QoS Differentiation

Jerzy Konorski

doi:10.1016/j.ins.2022.06.024

Defending against Fake VIP in Scant-Transparency Information Systems with QoS Differentiation

Abstract

In client-server information systems with quality of service (QoS) differentiation, Client may deplete Server’s resources by demanding unduly high QoS level. Such QoS abuse has eluded systematic treatment; known defenses using Client authorization, payments, or service request inspection prior to QoS assignment, are heuristic and environment-specific. We offer a game-theoretic approach on the premise that a service request is occasionally trusted to reduce the inspection cost. We call Fake VIP attack (FVA) a form of QoS abuse that consciously exploits Server’s trust. An FVA strategy instills trust to maximize Client’s utility gained from successful FVAs, whereas a trust strategy maximizes Server’s utility by trading her loss due to successful FVAs against the request inspection cost. We consider a realistic scant-transparency setting where only long-term utilities are observable. Against a probabilistic FVA strategy we design a trust strategy based on double-blind reputation. Assuming a memoryless service request stream we analyze the impact of the request inspection cost and information leakage on the utilities at the Stackelberg equilibrium of the arising game. Experimental comparison with a real-world internally correlated stream is also shown.

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Jerzy Konorski dr hab. inż.

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Articles

Type:

artykuły w czasopismach

Published in:

INFORMATION SCIENCES no. 607, pages 831 - 848,
ISSN: 0020-0255

Language:

English

Publication year:

2022

Bibliographic description:

Konorski J.: Defending against Fake VIP in Scant-Transparency Information Systems with QoS Differentiation// INFORMATION SCIENCES -Vol. 607, (2022), s.831-848

DOI: