Secure enough NFC/RFID implant

edited July 2015 in RFID/NFC

I'm a security freak with technology and the xNT is just not enough for me. It's VERY easily crackable and hard to use (32-bit pass every time you use it).
I'm searching for a smartcard-like implant, where it can challenge/response with RSA or a strong enough algorithm.
MIFARE Ultralight seems like a proper competitor but I can't find any implantable solutions.
I'm scared of building my own solution 'cause that'll be inside my body and I need some assurance that this won't go too wrong for me.
A very good DIY idea is this

Can anyone shed some light? :)
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