Fair Exchange -- An Evenhanded Certified Email System for Contract Signing -- Efficient ID-Based Optimistic Fair Exchange with Provable Security -- On the Quest for Impartiality: Design and Analysis of a Fair Non-repudiation Protocol -- Generic, Optimistic, and Efficient Schemes for Fair Certified Email Delivery -- Digital Signatures I -- Cryptanalysis of a Forward Secure Blind Signature Schemeā¦