Networks without user observability
Computers and Security
The dining cryptographers problem: unconditional sender and recipient untraceability
Journal of Cryptology
EUROCRYPT '89 Proceedings of the workshop on the theory and application of cryptographic techniques on Advances in cryptology
Anonymous Web transactions with Crowds
Communications of the ACM
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Chord: A scalable peer-to-peer lookup service for internet applications
Proceedings of the 2001 conference on Applications, technologies, architectures, and protocols for computer communications
Tarzan: a peer-to-peer anonymizing network layer
Proceedings of the 9th ACM conference on Computer and communications security
IPTPS '01 Revised Papers from the First International Workshop on Peer-to-Peer Systems
Proceedings of the First International Workshop on Information Hiding
A Reputation System to Increase MIX-Net Reliability
IHW '01 Proceedings of the 4th International Workshop on Information Hiding
Architecture and algorithms for a distributed reputation system
iTrust'03 Proceedings of the 1st international conference on Trust management
Reputation Systems for Anonymous Networks
PETS '08 Proceedings of the 8th international symposium on Privacy Enhancing Technologies
Towards a generic trust model – comparison of various trust update algorithms
iTrust'05 Proceedings of the Third international conference on Trust Management
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In this paper we present a novel approach to enable untraceable communication between pseudonyms. Our work provides strong sender and recipient anonymity by eliminating the need to know of each other's address.We use a variation of Chaum mixes to achieve unlinkability between sender and recipient and introduce a concept called extended destination routing (EDR) which relies on routing headers constructed in multiple layers of encryption and published in a distributed hash table (DHT). In order to communicate, a sender requests from the DHT the recipient's routing header, which is extended and used for routing the message via a mix cascade to this recipient.This work was performed in the context of the UniTEC reputation system and describes the functionality of its anonymous communication layer, which is completely independent of the other UniTEC layers. Although trust and reputation systems in general are typical application areas for our contribution, the presented concepts are suitable for various other application areas as well. We have implemented a prototype of UniTEC and present the first results from an ongoing evaluation in our network emulation testbed.