Auditable metering with lighweight security
Journal of Computer Security
Secure communications over insecure channels
Communications of the ACM
Pricing via Processing or Combatting Junk Mail
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
DOS-Resistant Authentication with Client Puzzles
Revised Papers from the 8th International Workshop on Security Protocols
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Client puzzles are commonly proposed as a solution to denial-of-service attacks. However, very few implementations of the idea actually exist, and there are a number of subtle details in the implementation. In this paper, we describe our implementation of a simple and backwards compatible client puzzle extension to TLS. We also present measurements of CPU load and latency when our modified library is used to protect a secure webserver. These measurements show that client puzzles are a viable method for protecting SSL servers from SSL based denial-of-service attacks.