detect encryption method

Is there a tool that automatically looks if popular encryption methods were used on a text if I have the decrypted as well as encrypted text?
If you don't know a tool could you please at least advise me to a forum where I could get some help with this.

>>1
I doubt it, as far as I know unless there is an unencrypted header the encrypted data appears as nothing more than random information. You can only tell what the encryption is if you succeed in decrypting it into something understandable.