I assume you mean just files on a drive, rather than files in an email...
(which could be s/mime or openpgp or just flat out encrypted). I can't
really think of any better tests--although I think you'd have to be careful
looking for patterns in the text. Could someone with a different character
set throw you off?
Anyway, ascii armored pgp and gnupg files usually have a comment section at
the beginning of the encryption block that reads, for example, "-----BEGIN
PGP MESSAGE-----" (That's five hyphens I believe.) Following it is a
version line, which may also be useful if you want to capture it. Mine
reads:
Version: Gnupg v1.0.6 (SunOS)
Hope that helps.
-John
Ahmed
Moustafa To: Ray Murphy <[EMAIL PROTECTED]>
<ahmed@arborn cc: [EMAIL PROTECTED]
et.org> Subject: Re: Is A File Encrypted?
12/06/01
09:13 AM
If you expect a certian pattern of text in the file, I think, you
can grep the file from the expected text pattern. If you find any, then
the file is not encrypted; otherwise, the probability of the file being
encrypted would be higher.
--Ahmed
[EMAIL PROTECTED] | http://arbornet.org/~ahmed
On Thu, 6 Dec 2001, Ray Murphy wrote:
> Hello,
>
> Want to make sure I'm not missing anything here. My
> task is to see if a file looks like it's encrypted.
> I'm splitting the path/filename/extension via
> File::Basename and checking to see if the extension is
> ..pgp or .gpg. I'm also checking to see if the file is
> a text file via 'if (-T $file)'. Is there any other
> (better) way of testing to see if a file is encrypted?
> I don't want to call the decryption routines if the
> file is not encrypted.
>
> Cheers
>
> Ray.
>
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