30. An improved password validation system according to claim 16, wherein the means for computing the probability of occurrence T utilizes a Markov model comprised of a common alphabet plus selected other characters.
30. An improved password validation system according to claim 16, wherein the means for computing the probability of occurrence T utilizes a Markov model comprised of a common alphabet plus selected other characters. 31. An improved password validation system according to claim 30, wherein said Markov model is a second order model.