Implementing Trustworthy Services Using Replicated State Machines
IEEE Security and Privacy
Type-Based Proxy Re-encryption and Its Construction
INDOCRYPT '08 Proceedings of the 9th International Conference on Cryptology in India: Progress in Cryptology
Usable secure mailing lists with untrusted servers
Proceedings of the 8th Symposium on Identity and Trust on the Internet
Inter-domain Identity-Based Proxy Re-encryption
Information Security and Cryptology
From proxy encryption primitives to a deployable secure-mailing-list solution
ICICS'06 Proceedings of the 8th international conference on Information and Communications Security
Video surveillance: a distributed approach to protect privacy
CMS'05 Proceedings of the 9th IFIP TC-6 TC-11 international conference on Communications and Multimedia Security
Using Prêt à Voter in Victorian state elections
EVT/WOTE'12 Proceedings of the 2012 international conference on Electronic Voting Technology/Workshop on Trustworthy Elections
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A protocol is given to take an ElGamal ciphertext encrypted under the key of one distributed service and produce the corresponding ciphertext encrypted under the key of another distributed service, but without the plaintext ever becoming available. Each distributed service comprises a set of servers and employs threshold cryptography to maintain its service private key. Unlike prior work, the protocol requires no assumptions about execution speeds or message delivery delays. The protocol also imposes fewer constraints on where and when various steps are performed, which can bring improvements in end-to-end performance for some applications (e.g., a trusted publish/subscribe infrastructure.) Two new building blocks employed 驴 a distributed blinding protocol and verifiable dual encryption proofs 驴 could have uses beyond re-encryption protocols.