4 papers · 1 filter
Employing Trusted Computing for the forward pricing of pseudonyms in reputation systems
Nicolai Kuntze, Dominique Maehler, Andreas U. Schmidt
Reputation and recommendation systems are fundamental for the formation of community market places. Yet, they are easy targets for attacks which disturb a market's equilibrium and…
Security and Non-Repudiation for Voice-Over-IP Conversations
Christian Hett, Nicolai Kuntze, Andreas U. Schmidt
We present a concept to achieve non-repudiation for natural language conversations by electronically signing packet-based, digital, voice communication. Signing a VoIP-based conver…
Trusted Computing in Mobile Action
Nicolai Kuntze, Andreas U. Schmidt
Due to the convergence of various mobile access technologies like UMTS, WLAN, and WiMax the need for a new supporting infrastructure arises. This infrastructure should be able to s…
A secure archive for Voice-over-IP conversations
Christian Hett, Nicolai Kuntze, Andreas U. Schmidt
An efficient archive securing the integrity of VoIP-based two-party conversations is presented. The solution is based on chains of hashes and continuously chained electronic signat…