On Mon June 29 2009, Kumar Rounak wrote:
> i am planning to make an encryption tool which uses openssl to encrypt the
> file using blowfish in cbc mode, is there any way to determine at the
> decrypting tool which is again written using openssl that a file is
> encrypted or not before actually attempting to decrypt the file.
> 

Q: Did you decrypt this question before posting it?
;)

Since you are the author of the encryption tool, did you include some
marker or header or such that could be used on the decryption end?

An encrypted message should not be distinguishable from random noise.
At least if everything is working as intended.  ;)

Mike
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