Re: Determining algorithm used

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Pfingstmann, Jason wrote:
> I have an old encrypted file with a .cpt extension.  I created this file
> using an old version of SuSE if memory serves.  I am trying to figure
> out how to figure out what utility/algorithm was used to create this
> file so I can take some stabs at decrypting it.  The file in question
> was a tar.gz file that was encrypted using some console based encryption
> program (with a command like "encrypt filename.ext" which produces
> "filename.ext.cpt"), which may help determine this. Is there maybe a


well, googling for "encrypt .cpt" reveals, that there is a program called
"ccrypt" which is ncrypting files and adding .cpt to the filename:

http://quasar.mathstat.uottawa.ca/~selinger/ccrypt/

the website says "ccrypt is based on the Rijndael cipher" so *if* ccrypt
was used to encrypt your file (crawl old SuSE distros for that program),
then we should have the algorithm.

> utility that would allow me to put in a password and have it try to
> decrypt using all known algorithms and perhaps show the first few lines
> from the decrypted file (so I can determine if one looks like a gz file

the plaintext, i.e. the "gz" contents should only be available when you
have the correct passphrase though...that's why it's encrypted ;-)

Christian.
- --
BOFH excuse #383:

Your processor has taken a ride to Heaven's Gate on the UFO behind
Hale-Bopp's comet.
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-
Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/


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