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1. (WO2013126881) PRIVACY-PRESERVING PUBLISH-SUBSCRIBE PROTOCOL IN A CLOUD-ASSISTED BROADCAST MODEL

Pub. No.:    WO/2013/126881    International Application No.:    PCT/US2013/027626
Publication Date: Fri Aug 30 01:59:59 CEST 2013 International Filing Date: Tue Feb 26 00:59:59 CET 2013
IPC: H04L 9/00
Applicants: APPLIED COMMUNICATION SCIENCES
Inventors: DI CRESCENZO, Giovanni
Title: PRIVACY-PRESERVING PUBLISH-SUBSCRIBE PROTOCOL IN A CLOUD-ASSISTED BROADCAST MODEL
Abstract:
A method and system for providing privacy in a publish-subscribe protocol is provided. A server receives from a third party a topic-based key associated with a tree structure having a pseudonym of a topic as a root and at least one client as a leaf. The server encrypts a key associated with a conditional oblivious transfer protocol using the topic-based key. The server encrypts an item with the key associated with the conditional oblivious transfer protocol. The server transmits the encrypted key and the encrypted item to a plurality of clients. The encrypted item is decryptable by the at least one client with the key associated with the conditional oblivious transfer protocol when the key associated with the conditional oblivious transfer protocol is decryptable with an interest-based key associated with a tree structure having a pseudonym of an interest as a root and the at least one client as a leaf.