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
Auditable Metering with Lightweight Security
FC '97 Proceedings of the First International Conference on Financial Cryptography
Proofs of Work and Bread Pudding Protocols
CMS '99 Proceedings of the IFIP TC6/TC11 Joint Working Conference on Secure Information Networks: Communications and Multimedia Security
Mitigating Distributed Denial of Service Attacks with Dynamic Resource Pricing
ACSAC '01 Proceedings of the 17th Annual Computer Security Applications Conference
Encapsulated Key Escrow
Proceedings of the 11th ACM conference on Computer and communications security
New client puzzle outsourcing techniques for DoS resistance
Proceedings of the 11th ACM conference on Computer and communications security
Scalable, Server-Passive, User-Anonymous Timed Release Cryptography
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
Computational Puzzles as Sybil Defenses
P2P '06 Proceedings of the Sixth IEEE International Conference on Peer-to-Peer Computing
Using client puzzles to protect TLS
SSYM'01 Proceedings of the 10th conference on USENIX Security Symposium - Volume 10
OSLO: improving the security of trusted computing
SS'07 Proceedings of 16th USENIX Security Symposium on USENIX Security Symposium
Timed release of standard digital signatures
FC'02 Proceedings of the 6th international conference on Financial cryptography
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Foundations of group signatures: the case of dynamic groups
CT-RSA'05 Proceedings of the 2005 international conference on Topics in Cryptology
Efficient and non-interactive timed-release encryption
ICICS'05 Proceedings of the 7th international conference on Information and Communications Security
Timed release cryptography from bilinear pairings using hash chains
CMS'06 Proceedings of the 10th IFIP TC-6 TC-11 international conference on Communications and Multimedia Security
SP 800-38A 2001 edition. Recommendation for Block Cipher Modes of Operation: Methods and Techniques
SP 800-38A 2001 edition. Recommendation for Block Cipher Modes of Operation: Methods and Techniques
Game theoretic resistance to denial of service attacks using hidden difficulty puzzles
ISPEC'10 Proceedings of the 6th international conference on Information Security Practice and Experience
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Cryptographic puzzles can be used to mitigate spam and denial-of-service (DoS) attacks, as well as to implement timed-release cryptography. However, existing crypto puzzles are impractical because: (1) solving them wastes computing resources and/or human time, (2) the time it takes to solve them can vary dramatically across computing platforms, and/or (3) applications become non-interoperable due to competition for resources when solving them. We propose the use of Trusted Computing in constructing crypto puzzles. Our puzzle constructions have none of the drawbacks above and only require each client machine to be equipped with a small tamper-resistant Trusted Puzzle Solver (TPS), which may be realized using the prevalent Trusted Platform Module (TPM) with minimal modifications.