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Re:Dropbox Acquires Boxcryptor’s Assets, to provide client-s... by CodesInChaos on Tuesday November 29, 2022 @04:56PM (#33793924)
Convergent encryption without a user specific key has two weaknesses:

1. You can tell that the user posses a known file. Such as a pirated movie. This is what this thread is about.

2. If the attacker knows the file except a sufficiently small secret part, they can learn that part.

https://tahoe-lafs.readthedocs.io/en/latest/convergence-secr...

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