For a certain computer program a password must be exactly 5
characters long. The first character...
For a certain computer program a password must be exactly 5
characters long. The first character can be any lowercase letter,
the second must be an uppercase letter, the third character must be
a number from 0 – 9, the fourth character can either be a lowercase
letter or a number 0 - 9, the fifth character has to be exactly the
same as the first character.
(6)
How many possible passwords are there?
What is the...
Suppose that a certain computer password is allowed to be from 8
to 12 characters long,...
Suppose that a certain computer password is allowed to be from 8
to 12 characters long, and may contain only lowercase letters (a to
z), uppercase letters (A to Z), and numbers (0 to 9).
1. How many such passwords are possible?
2. How many such passwords are possible if you cannot repeat
characters?
3. How many such passwords are possible if you cannot repeat
characters, and you must include
at least one number?
If you use a randomly chosen 4 character password (comprising
of all the lowercase, uppercase letters...
If you use a randomly chosen 4 character password (comprising
of all the lowercase, uppercase letters and digits 0 to 9), say
“Xp9m” how many maximum guesses are required by a computer to guess
this password? Compare the strength of this password with an 8
character password instead (say “Cm8Rz0pQ”) ? Show the simple math
that is underlying the calculation.
Do you agree with the statement “ An 8
letter password is around two times more secure than a 4...
A company wants to impose a more secure password system for its
employees to use on...
A company wants to impose a more secure password system for its
employees to use on the company’s network. The current policy
requires a minimum of seven characters. The system under
consideration requires a minimum of eight characters. The new
system will allow repetition of characters, but not doubling (e.g.,
the sequence 121 would be acceptable, but not 112).
For both password systems, assume the following:
Only alphanumeric characters can be used in the passwords,
without any spaces or symbols....
Each user on a computer system has a password, which is seven to
nine characters long,...
Each user on a computer system has a password, which is seven to
nine characters long, where each
character is an uppercase letter or a digit. Each password must
contain at least one digit or at
least one Uppercase letter. How many possible passwords are
there?
A computer password consists of: • letters {a, A, 6, B,
...,2,Z}, • digits {0, 1,...,9),...
A computer password consists of: • letters {a, A, 6, B,
...,2,Z}, • digits {0, 1,...,9), or = 16 • special characters
{!,@,#,$,%}. In addition, a password must • contain at least one
upper case letter, • contain at least one special character. How
many passwords of length 8 are possible?