PACT: Private Automated Contact Tracing

The PACT (Private Automated Contact Tracing) protocol is a simple, decentralized approach to using smartphones for contact tracing based on Bluetooth proximity. Users of this scheme do not reveal anything about themselves unless they volunteer to do so. In particular, users can volunteer to donate their private data to a (trusted) health authority, who can then use this data to further control the spread of the virus, but this is discretionary to the users. This protocol has been developed by a large collaboration of researchers, led by MIT, including participants from Boston University. The PACT project enables rapid accurate contract tracing that can be used to help control the spread of the coronavirus while preserving individual privacy.