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Choosing a Password
A system allows the user to choose a password with a length of one to
Eight characters, inclusive. Assume that 10,000 passwords can be tested
Per second. The system administrators want to expire passwords once they
Have a probability of 0.10 of having been guessed. Determine the expected
Time to meet this probability under each of the following conditions.
- Password characters may be any ASCII characters from 1 to 127,
- Password characters may be any alphanumeric characters (“A”
Through “Z,” “a” through “z,” and “0” through “9”).
- Password characters must be digits.
- Q2. A. when the characters on a Password are any ASCII characters from 1 to 127,
C = the number of letters in the alphabet
N = the sum number of passkeys
R = the guessing frequency (104 scaled to the suitable time entity)
T = refers to the set number of attempts expected before breaking the passkey.
Therefore, (T x R) / N = 0.10, the sum of the numeral attempts of the passkeys is the odds one out of ten (1/10). The sum number of passkeys is N = S-1 = 80iicc—119.
For that reason, C = 127, and T = 6.82 x 1011 seconds, which is equal to 21,629 years.
- When the Password characters are in any alphanumeric characters, which may be from (“A” to “Z,” “a” to “z,” and “0” to “9”).