Cryptology ePrint Archive: Report 2007/139
The Delivery and Evidences Layer
Amir Herzberg and Igal Yoffe
Abstract: Evidences of delivery are essential for resolving (and avoiding) disputes on delivery of
messages, in classical as well as electronic commerce. We present the first rigorous specifications and
provably-secure implementation, for a communication layer providing time-stamped evidences for the
message delivery process. This improves on existing standards for evidences (‘non-repudiation’) services,
based on informal specifications and unproven designs.
Our work also improves on the large body of analytical works on tasks related to evidences of delivery,
such as certified mail/delivery protocols and fair exchange (of signatures). We improve by addressing
practical needs and scenarios, using realistic synchronization and communication assumptions,
supporting time-outs and failures, and providing well-defined interface to the higher-layer protocols
(application). Furthermore, we use the layered specifications framework, allowing provably-secure use
of our protocol, with lower and higher layer protocols, with complete re-use of our analysis (theorems).
Category / Keywords: cryptographic protocols / certified delivery, cryptographic protocol, fair exchange, layered specifications, non-repudiation, secure e-commerce.
Date: received 19 Apr 2007
Contact author: igal yoffe at gmail com
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Version: 20070420:204434 (All versions of this report)
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