[ALUG] A question about encryption/security

[Eur Ing Chris Green]

If I use the encrypt/decrypt functions in vi (or a vi clone) how
secure is the resulting encrypted data likely to be?

I know that this encryption is not inherently very secure as it's just
a "one-rotor  machine  designed  along  the lines  of  the  German
Enigma, but with a 256-element rotor".

However given that the encrypted file has no clue to indicate that
it's encrypted or the algorithm used to encrypt it I think it would
actually be rather difficult to decrypt.

The potential code breaker has to:-
    Identify the file as being the one with the required data.
    Guess the algorithm used to encrypt it.
    Know the contents (or part of the contents).

Am I right in my thinking or does a file encrypted in this way show
any clues to how it was created?

-- 
Chris Green