how to avoid unauthenticated warning

[travis+ml-ubuntu-dev at subspacefield.org]

Hello,

I'm in the process of setting up my own Ubuntu repository for some local
packages.

I used the following HOWTOs:
https://help.ubuntu.com/community/AptMoveHowto
https://wiki.ubuntu.com/PackagingGuide/HandsOn

I use the following script:

for b in $(find dists -type d \( -name 'binary*' -o -name 'all' \))
do
        dpkg-scanpackages $b /dev/null | gzip -9c > $b/Packages.gz
done
for s in $(find dists -type d -name source)
do
        dpkg-scansources $s | gzip -9c > $s/Sources.gz
done
for r in intrepid jaunty
do
    rm dists/$r/Release
    apt-ftparchive -c ../$r.conf release dists/$r > dists/$r/Release
    gpg -ba -u 4F988F40 -o dists/$r/Release.gpg dists/$r/Release
done

However, I still get this error:

WARNING: The following packages cannot be authenticated!
  polipo-tor
Install these packages without verification [y/N]?

How do I avoid that error?

Is there an easier way of doing all this?
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