31. The method of claim 30 , further comprising the step of maintaining a storage that includes the one or more shared knowledge questions, wherein the storage is accessible over a network and the one or more shared knowledge questions included in the storage are associated with one or more specific parties who have accessed the first resource by entering acceptable answers to the one or more shared knowledge questions before the shared knowledge questions are reused to control access to the second resource, the party attempting to access the second resource being a member of the one or more specific parties who have successfully accessed the first resource.
31. The method of claim 30 , further comprising the step of maintaining a storage that includes the one or more shared knowledge questions, wherein the storage is accessible over a network and the one or more shared knowledge questions included in the storage are associated with one or more specific parties who have accessed the first resource by entering acceptable answers to the one or more shared knowledge questions before the shared knowledge questions are reused to control access to the second resource, the party attempting to access the second resource being a member of the one or more specific parties who have successfully accessed the first resource. 35. The method of claim 31 , further comprising the step of using the computing device for computing a probability that acceptable answers to each of the one or more shared knowledge questions can be successfully guessed, to aid in determining how many of the shared knowledge questions must be answered successfully before the party is allowed access to the second resource.