Avoiding loss of fairness owing to failures in fair data exchange systems

Avoiding Loss of Fairness Owing to Process Crashes in Fair Data Exchange Protocols

Fair exchange between two or more potentially mutually distrusted parties has been identified as an important issue in electronic commerce. However, the correctness (fairness) of the existing fair exchange protocols that use a Trusted Third Party (TTP) is based on the assumption that during an exchange there are no failures at any of the local systems involved in the exchange, which is too stro...

Avoiding Loss of Fairness Owing to Failures in Fair DataEx hange

Achieving autonomous fair exchange in ubiquitous network settings

This paper addresses the issue of fair (signature or key) exchange in emerging ubiquitous commerce (ucommerce). Such an application poses new security challenges. In particular, it involves distributed and autonomous operations running in a much open, dynamic and resource-diversified networking environment, which makes an exchange highly susceptible to security attacks and system failures. Exis...

Gracefully Degrading Fair Exchange with Security Modules

The fair exchange problem is key to trading electronic items in systems of mutually untrusted parties. In modern variants of such systems, each party is equipped with a tamper proof security module. The security modules trust each other but can only communicate by exchanging messages through their host parties. These hosts are untrusted and could intercept and drop those messages. We describe a...

Improving Tor security against timing and traffic analysis attacks with fair randomization

The Tor network is probably one of the most popular online anonymity systems in the world. It has been built based on the volunteer relays from all around the world. It has a strong scientific basis which is structured very well to work in low latency mode that makes it suitable for tasks such as web browsing. Despite the advantages, the low latency also makes Tor insecure against timing and tr...