And don't forget
Even if the path between the passport and the reader is completely secure, when your data reaches their system, it will be stored on their database. That means your photo (pristine quality), your fingerprints, your name, nationality, D.O.B., place of birth, and everything else on that passport.
Once you are in there, you will never get out of there. They will then make this information available to whomever wants it, without your consent or knowledge, and of course, if their database is compromised by whatever means, the data will leak out en masse.
When you go to any place on holiday, even the smallest country, your data will be captured. You might trust the German government to keep your data 'private' but would you trust, say, a 'third world' government to keep your data private? Some of the biggest 'third world countries' have just rolled out their own 'secure' passports and have the reader infrastructure coming next. When you go to these places, your passport data will be captured, and in these countries where corruption is endemic, you can bet that your data will be harvested and sold to the highest bidder on a regular basis.
All of this is not about the 'security' of the passport; this is about setting up a world wide system of control where the authorities can see who is going where in real-time. The amazing thing is, this aim can be achieved without invasive biometrics and RFID; it can be done with the machine readable strips that already exist on the passport.
It is nothing more than a pretext to fleece the sheeple, the money going to venal vendors.