CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Randomized algorithms
On Some Methods for Unconditionally Secure Key Distributionand Broadcast Encryption
Designs, Codes and Cryptography - Special issue: selected areas in cryptography I
Secure group communications using key graphs
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Relative differentiated services in the Internet: issues and mechanisms
SIGMETRICS '99 Proceedings of the 1999 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Key management for restricted multicast using broadcast encryption
IEEE/ACM Transactions on Networking (TON)
Communications of the ACM
The LSD Broadcast Encryption Scheme
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Pricing via Processing or Combatting Junk Mail
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
Efficient Trace and Revoke Schemes
FC '00 Proceedings of the 4th 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
A Practical Revocation Scheme for Broadcast Encryption Using Smart Cards
SP '03 Proceedings of the 2003 IEEE Symposium on Security and Privacy
Time-lock Puzzles and Timed-release Crypto
Time-lock Puzzles and Timed-release Crypto
Broadcast encryption with short keys and transmissions
Proceedings of the 3rd ACM workshop on Digital rights management
Position: the user is the enemy
NSPW '07 Proceedings of the 2007 Workshop on New Security Paradigms
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When distributing digital content over a broadcast channel it's often necessary to revoke users whose access privileges have expired, thus preventing them from recovering the content. This works well when users make a conscious decision to leave the system or have misbehaved, but numerous cases exist in which the revocation is in error and users are consequently left with the often onerous burden of getting reinstated. We introduce a gradual form of revocation that we call service degradation that enables the content distributor to provide "cues" to the user in the form of degraded system performance. The cues alert the user to their impending revocation and allow them to take the necessary action to remain in the system. Our protocols build on techniques for broadcast encryption and spam-fighting to provide the appropriate form of service for this previously ignored class of users.