Looking for some more details on "Turing" devices
A Turing machine is a simple theoretical/conceptual computational device based on state.  Computation is done through state transitions based on the machines current state.  It is popular in Computer Science theory due to how models and proofs can be built off of it.  Wikipedia has a far more detailed write up on Turing machines than is practical to put here and a general discussion of Turing machines is probably off topic for IT Security.  Computer Science is probably a good place to ask more about Turing machines in general, since they are a fundamental conceptual device for Computer Science theory.

In case you are a visual-learner, interestingly enough, there exist physical incarnations of the abstract device.