Pricing via Processing or Combatting Junk Mail
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
New client puzzle outsourcing techniques for DoS resistance
Proceedings of the 11th ACM conference on Computer and communications security
Security Notions and Generic Constructions for Client Puzzles
ASIACRYPT '09 Proceedings of the 15th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Low-cost client puzzles based on modular exponentiation
ESORICS'10 Proceedings of the 15th European conference on Research in computer security
Stronger difficulty notions for client puzzles and denial-of-service-resistant protocols
CT-RSA'11 Proceedings of the 11th international conference on Topics in cryptology: CT-RSA 2011
Efficient modular exponentiation-based puzzles for denial-of-service protection
ICISC'11 Proceedings of the 14th international conference on Information Security and Cryptology
Recoverable encryption through a noised secret over a large cloud
Transactions on Large-Scale Data- and Knowledge-centered systems IX
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Client puzzles are cryptographic problems that are neither easy nor hard to solve. In this paper, we solve the problem of constructing cryptographic puzzles that are secure in the standard model and are very efficient. To prove the security of our puzzle, we introduce a new variant of the interval discrete logarithm assumption which may be of independent interest, and show this new problem to be hard under reasonable assumptions. Our experimental results show that, for 512-bit modulus, the solution verification time of our proposed puzzle can be up to 50x and 89x faster than that of the existing puzzles.