We present a new protocol that allows two players to exchange digital signatures over the
Internet in a fair way, so that either each player gets the other's signature, or neither player …

We present a new protocol that allows two players to exchange digital signatures over the
Internet in a fair way, so that either each player gets the other's signature, or neither player …

The optimistic approach of involving a third party only in the case of exceptions is a useful
technique to build secure, yet practical fair exchange protocols. Previous solutions using this …

We present protocols for fair exchange of electronic data (digital signatures, payment and
confidential data) between two parties A and B. Novel properties of the proposed protocols …

We present new protocols for two parties to exchange documents with fairness, ie, such that
no party can gain an advantage by quitting prematurely or otherwise misbehaving. We use a …

With the phenomenal growth of the Internet and open networks in general, security services,
such as non-repudiation, become crucial to many applications. Non-repudiation services …

We introduce the notion of abuse-free distributed contract signing, that is, distributed contract
signing in which no party ever can prove to a third party that he is capable of choosing …

Commerce over open networks like the Internet, sometimes referred to as electronic
commerce, is becoming more widespread. This makes it important to study, and solve the …

Systems and methods are provided for managing the transfer of electronic files. In one
embodiment, a sender transfers an encrypted version of a file (such as a digitally encoded …

Fairness may be a desirable property of a non-repudiation service. Protocols can achieve
fairness through the involvement of a trusted third party but the extent of the trusted third …