Trust*: Using Local Guarantees to Extend the Reach of Trust

Stephen Clarke, B. Christianson, Hannan Xiao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)
276 Downloads (Pure)


We propose a new concept called trust* as a way of avoiding the necessity to transitively trust others in a range of distributed environments. The trust* approach uses guarantees based upon already established trust relationships. These localised guarantees are then used to extend trust to a new relationship (which we call trust*) which can hold between principals which are unknown to and do not trust one another. Such chains of guarantees enable the risk involved to be shifted to another party (in a similar way to real world guarantees). If a guarantee is broken, some kind of `forfeit' is imposed, either to compensate the client or to deter the server from doing it habitually. Due to trust (and hence also forfeits) being localised, the specic micro-payment and trust management mechanisms that are used to implement the protocol can
be heterogeneous. This paper describes the concept of trust* and some
possible applications within a domain where the service being provided
is also electronic.
Original languageEnglish
Title of host publicationSecurity Protocols XVII
PublisherSpringer Nature
Number of pages8
ISBN (Electronic)978-3-642-36213-2
ISBN (Print)978-3-642-36212-5
Publication statusPublished - 2013
EventThe Seventeenth International Workshop on Security Protocols, Cambridge - Cambridge, United Kingdom
Duration: 13 Apr 2009 → …

Publication series

NameLecture Notes in Computer Science


ConferenceThe Seventeenth International Workshop on Security Protocols, Cambridge
Country/TerritoryUnited Kingdom
Period13/04/09 → …


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