> Is it possible to determine what crypto-type (aes, twofish, blowfish, > etc) that has been used to crypt a file by just looking in the file > examining its content?
No.
How can you be so sure about this? Can your refer to some document proving/stating that?
> If not it maybe would be possible to increase security be allowing > many different crypto-types in the system and create a small script > used for seting up the crypto-loop that takes the crypto-type as an > arg: <snip>
This doesn't make the system more secure than using different (good) keys.
Ofcourse I suppose that one uses good keys. What I meant was that if you don't know what chipher that has been used then you have to try many different ways for attacking the crypto.
As far as I know you have to use quite different ways to attack cryptos that have been crypted with different chiphers. I think that may take much longer time since you don't know for sure what way to use for attacking the crypto.
Best regards,
Jonap
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Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
