Risk balance in optimistic non-repudiation protocols

Authors:
Mohammad Torabi Dashti;Jan Cederquist;Yanjing Wang
Affiliations:
ETH Zürich, Switzerland;Dep. Engenharia Informática, Instituto Superior Técnico, Universidade Técnica de Lisboa, SQIG, Instituto de Telecomunicações, Portugal;Department of Philosophy, Peking University, Beijing, China
Venue:
FAST'11 Proceedings of the 8th international conference on Formal Aspects of Security and Trust
Year:
2011

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Abstract

We investigate how the behaviors of malicious trusted parties affect participants of optimistic non-repudiation protocols. We introduce a notion of risk balance for exchange protocols. Intuitively, risk balance refers to fairness in the amount of protection a protocol offers to the participants against malicious trustees. We explore how risk balance relates to the notions of accountable trustees and transparent trustees previously introduced by Asokan and Micali, respectively. As a case study, we investigate the consequences of malicious behaviors of trusted parties in the context of two fair non-repudiation protocols, proposed by Gürgens, Rudolph and Vogt (2005). We discover a number of security issues in these protocols and propose simple solutions for fixing them.