Optimised Multi-Party Certified Email Protocols
Jianying Zhou, Jose Antonio Onieva, Javier López, Heng Mui, Keng Terrace · 2005
As a value-added service to deliver important data over the Internet with guaranteed receipt for each successful delivery, certified email has been discussed for years and a number of research papers appeared in the literature. But most of them deal with the two-party scenarios, i.e., there are only one sender and one recipient. In some ap- plications, however, the same certified message may need to be sent to a set of recipients. In this paper, we present two optimized multi-party certified email protocols. Both of them have three major features. (1) A sender could notify multiple recipients of the same information while only those recipients who acknowledged are able to get the information. (2) Both the sender and the recipients can end a protocol run at any time without breach of fairness. (3) The exchange protocols are optimized, each of which has only three steps, and the TTP will not be involved unless an exception (e.g., a network failure or a party's misbehavior) occurs.