The FBI has proven that they can unwind transactions cycled through tumblers.
One concept in encryption is 'secure enough for long enough'. If the message is 'We attack Monday morning' and the message is not decrypted until Tuesday, after the attack, then it was good enough encryption. Thus there's lots of 'it depends' on how good the security needs to be.
One advantage of breaking old message traffic in criminal proceedings would be to use it to rattle people. If you're interrogating someone and casually slip 'When you told George to kill Freddy on December 6, 1992...' it could have an unnerving effect since they've thought they were clean on a killing that was over 30 years ago.
This news about the UK trying to force Apple to break their encryption is quite troubling. Apparently Apple is considering just turning it off for the UK, which would probably be a field day for the Tabloids vs the Pols.
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One concept in encryption is 'secure enough for long enough'. If the message is 'We attack Monday morning' and the message is not decrypted until Tuesday, after the attack, then it was good enough encryption. Thus there's lots of 'it depends' on how good the security needs to be.
One advantage of breaking old message traffic in criminal proceedings would be to use it to rattle people. If you're interrogating someone and casually slip 'When you told George to kill Freddy on December 6, 1992...' it could have an unnerving effect since they've thought they were clean on a killing that was over 30 years ago.
This news about the UK trying to force Apple to break their encryption is quite troubling. Apparently Apple is considering just turning it off for the UK, which would probably be a field day for the Tabloids vs the Pols.