Encrypted Messaging Apps Have Limitations You Should Know | WIRED
►https://www.wired.com/story/encrypted-messaging-isnt-magic
Signal, WIRED’s secure messaging recommendation, is open source, but it also proved its trustworthiness in a 2016 case where the service was subpoenaed. Developer Open Whisper Systems responded to a grand jury subpoena saying it could only produce the time an account was created and the most recent date that a user’s Signal app connected to its servers. The court had asked for significantly more detail like user names, addresses, telephone numbers, and email addresses. Signal had retained none of it.
More is Less: On the End-to-End Security of Group Chats in
Signal, WhatsApp, and Threema
▻https://eprint.iacr.org/2017/713.pdf