[SG2] Electronic Dog Tags (was APFCs in Stargrunt)

> Nyrath the nearly wise <nyrath@clark.net> wrote:

Just use RSA security (huge prime numbers and trapdoor functions). The
electronic dog tag checks the transmitted code _first_ before responding
in any way. Once the codes check out and the interrogation message is
decrypted, then the dogtag sends an encrypted message back in response.

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> Adrian Johnson wrote:
Use RSA security codes and combine the message with the time and date. The
implanted IFF device only responds to correctly coded messages.

> Would yours "turn off" if the "carrier" dies? If they did, you
The implant could easily monitor the electrical activity of the brain or even
a simple thing like blood pressure and send this encrypted along with data in
the IFF implant. If the implant sends back a signal indicating blood pressure
near zero and no brain electrical activity, it would be safe to assume the
body the implant is in is dead and shouldn't be given access!