ACM Transactions on Computer Systems (TOCS)
Untraceable electronic mail, return addresses, and digital pseudonyms
Communications of the ACM
Tor: the second-generation onion router
SSYM'04 Proceedings of the 13th conference on USENIX Security Symposium - Volume 13
PAR: Payment for Anonymous Routing
PETS '08 Proceedings of the 8th international symposium on Privacy Enhancing Technologies
Cryptographic protocol analysis of AN.ON
FC'10 Proceedings of the 14th international conference on Financial Cryptography and Data Security
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In recent years several payment schemes have emerged for anonymous communication systems such as AN.ON and Tor. In this paper we briefly present a payment scheme that is deployed and currently used by AN.ON. The main contribution of this paper is a security analysis of the most important cryptographic protocols involved in the payment process. The analysis of the protocols shows that they contain several weaknesses that need to be addressed to provide a fair service. We show how an attacker can use the weaknesses to surf on other's credits. Finally, we propose a fix for the protocols in order to withstand the encountered attacks.