[HunterWare]

How do you secure something when other's know the secret? There has to be some "secret" (aka key) that some definition of "you" only knows, that the system then tests against (hopefully via some kind of asymmetric system or hash).

[rovr138]

Public/private keys?

In this case, since others already know it, signing something is sufficient.

[HunterWare]

Yep. The signing is done with public/private (aka asymmetric) keys and some kind of hashing mechanism.