amd64 stable release signature problems?

["Török Edvin" <edwintorok@gmail.com>]

Hi,

Today I got this error while running `aptitude update`:

W: GPG error: http://amd64.debian.net stable Release: The following
signatures were invalid: BADSIG E415B2B4B5F5BBED Debian AMD64 Archive
Key <debian-amd64@lists.debian.org>


The Release file for testing and sid are fine. What is going on, did
the release file get corrupt?
FYI: I am using sid, but I kept stable in my sources.list, now that
there are key problems, I've deleted it from sources.list. But still,
why this error?

Thanks,
Edwin