TitleRisk balance in optimistic non-repudiation protocols
AuthorsTorabi Dashti, Mohammad
Cederquist, Jan
Wang, Yanjing
AffiliationETH Z??rich, CBN F 109, Universit?tstrasse 6, 8092, Switzerland
Dep. Engenharia Inform??tica, Instituto Superior T??cnico, Universidade T??cnica de Lisboa, Portugal
Department of Philosophy, Peking University, 100871 Beijing, China
Issue Date2012
Citation8th International Workshop on Formal Aspects of Security and Trust, FAST 2011.Leuven, Belgium,7140 LNCS(263-277).
AbstractWe 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 Gurgens, Rudolph and Vogt (2005). We discover a number of security issues in these protocols and propose simple solutions for fixing them. ? 2012 Springer-Verlag.
Appears in Collections:哲学系(宗教学系)

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