1. Assume an 8-letter password from the 95 printable ASCII characters is used in a computer system. a. If passwords are chosen by the users, what is the total password population? What is the probability of an adversary guessing a password correctly? b. If passwords are generated automatically by a pseudorandom number generator, what is the total password population? What is the probability of an adversary guessing a password correctly? 2.Explain why, for the biometric authentication protocols, the biometric capture device is authenticated in the case of static biometric but not authenticated for a dynamic biometric.
1. Assume an 8-letter password from the 95 printable ASCII characters is used in a
computer system.
a. If passwords are chosen by the users, what is the total password population? What is
the probability of an adversary guessing a password correctly?
b. If passwords are generated automatically by a pseudorandom number generator,
what is the total password population? What is the probability of an adversary guessing
a password correctly?
2.Explain why, for the biometric authentication protocols, the biometric capture device is
authenticated in the case of static biometric but not authenticated for a dynamic biometric.
a. For the user-chosen password, the total password population would be 95^8 = 6,634,204,312,890 different possible passwords. The probability of an adversary guessing the password correctly would be 1/6,634,204,312,890, which is a very low probability.
b. For the automatically generated password, the total password population would also be 95^8. However, the probability of an adversary guessing the password correctly would depend on the quality of the pseudorandom number generator used to generate the passwords. If the generator is truly random, the probability would be the same as for user-chosen passwords. However, if the generator is not truly random, the probability of an adversary guessing the password correctly could be higher.
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