The big question that I have is whether the "key" in this scenario is a hash (or a pieces of a hash), or if it is randomly assigned. The former is much more su

The big question that I have is whether the "key" in this scenario is a hash (or a pieces of a hash), or if it is randomly assigned. The former is much more susceptible to being reverse engineered and hacked. Especially with a relatively small search space: ~30 bits.