Jixin Zhang

Anonymous Asynchronous Ratchet Tree Protocol for Group Messaging

2021 · Sensors

Signal is the first application that applies the double ratchet for its end-to-end encryption protocol. The core of the double ratchet protocol is then applied in WhatsApp, the most popular messaging application around the world. …

Privacy-Preserving Task Matching With Threshold Similarity Search via Vehicular Crowdsourcing

2021 · IEEE Transactions on Vehicular Technology

In vehicular crowdsourcing, task requesters rely on a server to distribute spatial crowdsourcing tasks to on-road vehicular workers based on interests and locations. To protect the privacy of the interests and locations, both requesters and …