In this paper, we therefore propose a new, widely applicable definition of accountability, with interpretations both in symbolic and computational models. Our definition reveals that accountability is closely related to verifiability, for which we also propose a new definition. We prove that verifiability can be interpreted as a restricted form of accountability. Our findings on verifiability are of independent interest.
As a proof of concept, we apply our definitions to the analysis of protocols for three different tasks: contract-signing, voting, and auctions. Our analysis unveils some subtleties and unexpected weaknesses, showing in one case that the protocol is unusable in practice. However, for this protocol we propose a fix to establish a reasonable level of accountability.Category / Keywords: cryptographic protocols / Accountability, Verifiability, Protocol Analysis, E-Voting, Auction, Contract Signing Date: received 27 Apr 2010 Contact author: kuesters at uni-trier de Available formats: PDF | BibTeX Citation Version: 20100428:140053 (All versions of this report) Discussion forum: Show discussion | Start new discussion