Extra dashes when crearsigning a file?

[Johan Wevers]

Hello,

This quastion was posted in the Dutch newsgroup nl.comp.crypt and I didn't
know the answer so I'll ask it here:

When you clearsign a file which contains lines that start with a dash, an
extra dash is introduced, why is that?

vulcan:~> cat 1.txt
- <00000fba640b$00006af8$00005f2f@210.160.73.146>
- <00001e370ac4$000003ab$000063b5@vio.co.jp>

vulcan:~> gpg --clearsign 1.txt
[asking for passwd, etc.]

vulcan:~> cat 1.txt.asc
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- - <00000fba640b$00006af8$00005f2f@210.160.73.146>
- - <00001e370ac4$000003ab$000063b5@vio.co.jp>

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.0 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE46QYRIWmgtYYVa4URAnKgAJ9tBkyeNmGZaE9jBipQUJS1jbUh7gCeM5yU
fiesAhdnae18WIlpL4IKLAg=
=u1AI
-----END PGP SIGNATURE-----

-- 
ir. J.C.A. Wevers         //  Physics and science fiction site:
johanw@vulcan.xs4all.nl   //  http://www.xs4all.nl/~johanw/index.html
PGP/GPG public keys at http://www.xs4all.nl/~johanw/pgpkeys.html