sudo apt-get update
Hit http://security.debian.org wheezy/updates Release.gpg
Hit http://security.debian.org wheezy/updates Release
Get:1 http://packages.crunchbang.org waldorf Release.gpg [10.4 kB]
Ign http://security.debian.org wheezy/updates/main Translation-en
Err http://security.debian.org wheezy/updates/main i386 Packages
  404  Not Found [IP: 212.211.132.32 80]
Get:2 http://http.debian.net wheezy Release.gpg [2,373 B]
Get:3 http://packages.crunchbang.org waldorf Release [10.4 kB]
Ign http://packages.crunchbang.org waldorf Release
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906
E: GPG error: http://packages.crunchbang.org waldorf Release: The following signatures were invalid: NODATA 1 NODATA 2

my source list >

## CRUNCHBANG
## Compatible with Debian Wheezy, but use at your own risk.
deb http://packages.crunchbang.org/waldorf waldorf main
#deb-src http://packages.crunchbang.org/waldorf waldorf main

## DEBIAN
deb http://http.debian.net/debian wheezy main contrib non-free
#deb-src http://http.debian.net/debian wheezy main contrib non-free

## DEBIAN SECURITY
deb http://security.debian.org/ wheezy/updates main
#deb-src http://security.debian.org/ wheezy/updates main