Proof of email ownership

Simon Josefsson jas at
Mon Aug 8 14:24:50 CEST 2005

Werner Koch <wk at> writes:

> To create a signature on an email (or any other data) you would use:
>   gpg -s -Npka-address at at foo

I get this:

jas at latte:~$ gpg -s -Npka-address at at foo

You need a passphrase to unlock the secret key for
user: “Simon Josefsson <simon at>”
1280-bit RSA key, ID B565716F, created 2002-05-05

gpg: can't put notation data into v3 (PGP 2.x style) signatures
jas at latte:~$

Is my key unusable with this scheme?

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