A public key cryptosystem and a signature scheme based on discrete logarithms
Proceedings of CRYPTO 84 on Advances in cryptology
STOC '87 Proceedings of the nineteenth annual ACM symposium on Theory of computing
The effects of filtered video on awareness and privacy
CSCW '00 Proceedings of the 2000 ACM conference on Computer supported cooperative work
Communications of the ACM
Fundamentals of Computer Security
Fundamentals of Computer Security
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Proactive Secret Sharing Or: How to Cope With Perpetual Leakage
CRYPTO '95 Proceedings of the 15th Annual International Cryptology Conference on Advances in Cryptology
Preserving Privacy by De-Identifying Face Images
IEEE Transactions on Knowledge and Data Engineering
Distributed Blinding for Distributed ElGamal Re-Encryption
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
Protocols for secure computations
SFCS '82 Proceedings of the 23rd Annual Symposium on Foundations of Computer Science
A threshold cryptosystem without a trusted party
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
Secure distributed key generation for discrete-log based cryptosystems
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
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The topmost concern of users who are kept under surveillance by a CCTV-System is the loss of their privacy. To gain a high acceptance by the monitored users, we have to assure, that the recorded video-material is only available to a subset of authorized users under exactly previously defined circumstances. In this paper we propose a CCTV video surveillance system providing privacy in a distributed way using threshold multi-party computation. Due to the flexibility of the access structure, we can handle the problem of loosing private-key-shares that are necessary for reconstructing video-material as well as adding new users to the system. If a pre-defined threshold is reached, a shared update of the master secret and the according re-encryption of previously stored ciphertext without revealing the plaintext is provided.