Debmirror Public Key Not Found

["Zaki Akhmad" <zakiakhmad@gmail.com>]

Hi

I am trying to make mirror debian repository to my portable harddisk.
I am having difficulty with public key. Which public key I should
export? To where?

Here's the result after I execute debmirror
Mirroring to main from ftp://anonymous@komo.vlsm.org//debian/
Arches: i386
Dists: sid
Sections: main,contrib,non-free,main/debian-installer
Will clean up AFTER mirroring.
Pdiff mode: use.
Attempting to get lock, this might take 2 minutes before it fails.
Get Release files.
[0%] Keeping: dists/sid/Release
[0%] Keeping: dists/sid/Release.gpg
gpgv: keyblock resource `/home/za/.gnupg/trustedkeys.gpg': general error
gpgv: Signature made Wed 03 Sep 2008 03:52:53 PM WIT using DSA key ID 6070D3A1
[GNUPG:] ERRSIG A70DAF536070D3A1 17 2 00 1220431973 9
[GNUPG:] NO_PUBKEY A70DAF536070D3A1
gpgv: Can't check signature: public key not found
Release signature does not verify.
Errors:
 Release signature does not verify.
Failed to download some Release or Release.gpg files!
WARNING: releasing 1 pending lock...

Here's my list-key
za@zara:~$ gpg --list-keys
/home/za/.gnupg/pubring.gpg
---------------------------
pub   1024D/F20CB797 2008-09-02 [expires: 2009-09-02]
uid                  Zaki Akhmad (za) <zakiakhmad@gmail.com>
sub   2048g/7A6F1AF7 2008-09-02 [expires: 2009-09-02]

pub   1024D/813B3EDE 2008-09-02 [expires: 2009-09-02]
uid                  Zaki Akhmad (za) <za@design.paume.itb.ac.id>
sub   2048g/90CDA8D9 2008-09-02 [expires: 2009-09-02]

pub   1024D/6070D3A1 2006-11-20 [expires: 2009-07-01]
uid                  Debian Archive Automatic Signing Key (4.0/etch)
<ftpmaster@debian.org>

pub   1024D/ADB11277 2006-09-17
uid                  Etch Stable Release Key <debian-release@lists.debian.org>

pub   1024D/BBE55AB3 2007-03-31 [expires: 2010-03-30]
uid                  Debian-Volatile Archive Automatic Signing Key (4.0/etch)
sub   2048g/36CA98F3 2007-03-31 [expires: 2010-03-30]

pub   1024D/F42584E6 2008-04-06 [expires: 2012-05-15]
uid                  Lenny Stable Release Key <debian-release@lists.debian.org>

Actually I can add --ignore-release-gpg But it don't solve the
problem. It's quitting the problem ;-)

-- 
Zaki Akhmad