Re: Basic File Encyption
From: Michael Amling (nospam_at_nospam.com)
Date: 12/15/03
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Date: Mon, 15 Dec 2003 02:29:25 GMT
Joe wrote:
> I've been teaching myself basic cryptography, and I understand most of
> the principles, but there are some implementation issues I'm still not
> understanding. Namely, if one uses a program to encrypt a file using a
> blowfish algorithm (or any other block cipher, it doesn't matter) by
> entering a passphrase, and then you try to decrypt it using the same
> program, how does the program know if you have entered the right
> passphrase? Because theoretically, there should be no plaintext copy
> of the password for the program to compare against.
Doesn't the ciphertext have a Message Authentication Code?
--Mike Amling
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