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It's all about the Perfect Forward Secrecy.

What Is the Signal Encryption Protocol?

As the Signal protocol becomes the industry standard, it's worth understanding what sets it apart from other forms of end-to-end encrypted messaging.

wired.com/story/signal-encrypt

"Perfect forward secrecy is useless, it's important to note, if users don't delete their messages periodically. If someone's phone is seized or stolen with all their messages still intact, they'll be just as visible to whoever has the phone in hand as they were to the original owner."

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