Quote from: pesci on Today at 07:11:52 AM

Person A connects a $15,000 mining rig to his computer and starts churning out many terahashes per second, in the form of "shares".
Person B connects nothing to his computer, but instead modifies cgminer to pretend that it is communicating with a $15,000 mining rig and generates the exact same number of terahashes per second, however they are all faked random nonsense. When the pool finally finds a valid PoW, Person B gets a share of the proceeds despite not submitting valid shares.
What is there to prevent person B from doing this?
Or to put it another way, what is the process by which a share is actually verified to have been performed on real hardware, since (AFAIK) a share typically does not include a successful PoW that results in new coins?

Lol! The shares are validated itself during the mining process. In every shares found, there are two options - accepted or rejected. So the algorithm would tag the shares of person B as rejected while the shares of person A will be accepted.

If the process of peraon B could get him some valid shares, then no one would be buying mining rigs. Instead all will use fake mining programs to mine and make money out of it.

If someone has approached you with such proposal, stay out of that!