Zimon, please, for the last time - let Debian folks care about Deb(ian). Free and Open Source Software is not about telling *other* people what and how they should use.
Note: on most distros, dpkg/apt will not check the signature of a package when installing it, even if a signature is present. This checking can be enabled by removing the --no-debsig line from /etc/dpkg/dpkg.cfg.