01 Nov Signal App Tests Metadata Removal Technique
Secure messaging app Signal announced this week that it is testing a new technique that will minimize metadata in communications that may be accessible to its servers.
Signal says that its “sealed sender” technique should remove most of the plain-text sender information from message headers. It will use two new devices to avoid privacy risks: short-lived, encrypted sender certificates that store the sender’s phone number, public key, and expiration timestamp, and delivery tokens derived from the sender’s profile key which will prevent abuse.
Source: ARS Technica
