The second person follows immediately behind the first person and so on. If you are satisfied that the person is who they say they are, and that the key on the printout is theirs, you place another checkmark next to their key on your printout. Once the first person cycles back around to the front of the line he has checked all the other IDs and his ID has been checked by all others. For large key signing parties, a small number of trusted individuals can act as a verification committee. The verification committee is responsible for verifying the identity of each participant.
Participants also verify the identity of each member of the verification committee.
After this has been completed, the verification committee then publishes a list of introduced keys which then all participants sign. While this method is capable of introducing a large number of keys in a small amount of time, a large amount of trust is placed in the verification committee. The ultimate verification committee is known as a certificate authority . Thawte has also instituted a web of trust mechanism that allows trusted parties to introduce new people to Thawte. You can also request X.509 certificates, signed by Thawte, for use in secure email.