Signal, the popular messaging service with end-to-end encryption, stores precious little user data — "Unix timestamps for when each account was created and the date that each account last connected to the Signal service."
So when the FBI subpoenaed Signal to turn over "a wide variety of information… including the addresses of the users, their correspondence, and the name associated with each account," Signal enlisted the aid of the ACLU, which replied to the FBI with a polite version of the Willy Winka "you get nothing" meme. — Read the rest
