Sorry when i said similar i meant equivalent i didn't assume content
based hashing with a similarity threshold, etc...
Regards,
Iraklis
On 07/12/2013 05:57 PM, Tony Arcieri wrote:
On Fri, Jul 12, 2013 at 2:37 AM, Iraklis . <leont...@gmail.com
<mailto:leont...@gmail.com>> wrote:
You are missing the following:
Files are encrypted for deduplication. That implies a way to
derive a key from the content of the files. That is if two files
are similar they will have similar ciphertexts
No, because they are encrypted under a key derived by a hash function,
and one property of a secure hash function is that similar content
produces completely different hashes, even if you just change one bit.
Using this content hash to seed a PRNG (and derive encryption keys for
the content) will produce completely different pseudorandom padding,
even for similar files.
--
Tony Arcieri
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