A distributed system using passwords as the authentication means can
use a number of techniques to make the password system stronger.
Which of the following is NOT one of these techniques?

A.
Regular password reuse

B.
Password generators

C.
Limiting the number or frequency of log-on attempts

D.
Password file protection

Explanation:
Passwords should never be reused after the time limit on their use
has expired.
Answer “password generators” supply passwords
upon request. These passwords are usually comprised of numbers,
characters, and sometimes symbols. Passwords provided by
password generators are, usually, not easy to remember.
For answer “password file protection” may consist of encrypting the password
with a one-way hash function and storing it in a password file. A

typical brute force attack against this type of protection is to encrypt
trial password guesses using the same hash function and to compare
the encrypted results with the encrypted passwords stored in the
password file.
Answer “Limiting the number or frequency of log-on attempts” provides protection in that, after a
specified
number of unsuccessful log-on attempts, a user may be locked out
of trying to log on for a period of time. An alternative is to
progressively increase the time between permitted log-on tries after
each unsuccessful log-on attempt.