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Posted by JediKnight2 on April 18, 2006, 8:52 am
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If I have a file with an .enc extension is there any way that I can
tell what type of encryption, AES or Blowfish, was used?
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Posted by Unruh on April 18, 2006, 11:32 am
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>If I have a file with an .enc extension is there any way that I can
>tell what type of encryption, AES or Blowfish, was used?
If you have the key, use it in both and see which one decypts the file.
Otherwise no.
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Posted by Walter Roberson on April 18, 2006, 11:58 am
If you were Registered and logged in, you could reply and use other advanced thread options >If I have a file with an .enc extension is there any way that I can
>tell what type of encryption, AES or Blowfish, was used?
The file extension .enc is used by a number of programs, many of
which have nothing to do with encryption.
Here's a reference to the file format of a .enc file for an AES
encryptor. If you examine the format given there, you will see there is
nothing there which would indicate what kind of encryption is in use.
Other programs that generate .enc files might or might not contain
information that indicates the algorithm type, but to say more about
those, we would have to know which program you are using.
http://fp.gladman.plus.com/cryptography_technology/fileencrypt/
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Posted by Joshua Reed on April 26, 2006, 3:50 pm
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Posted by Walter Roberson on April 26, 2006, 4:47 pm
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>>If I have a file with an .enc extension is there any way that I can
>>tell what type of encryption, AES or Blowfish, was used?
Please quote context. Please see here for information on how to
do so from Google Groups: http://cfaj.freeshell.org/google/
Amongst other things, it would have saved me from having to dig through
previous postings to find the original question to restore into
the conversation.
>Nope, not the algorithm, that's sort of the point...
No, I'd have to disagree. AES and Blowfish were both designed to
be computationally very expensive to break *even knowing the algorithm*.
At most, not knowing whether the file was encrypted with AES or Blowfish
doubles the work involved -- the equivilent of adding one more bit to
the key. That's not an important difference compared to the average
2^191 (3138550867693340381917894711603833208051177722232017256448)
operations required to break AES-192.
The .enc file could potentially have included the plaintext string:
JoshCrypt 3.72/AES-192
and it would not have materially affected the difficulty of decryption.
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