What types of one-time passwords are available?
What will be an ideal response?
Challenge-response passwords-The authenticating computer or firewall generates a random number (the challenge) and sends it to the user, who enters a secret PIN or password (the response). If the code and PIN or password match the information stored on the authenticating server, the user gains access.
Password list passwords-The user enters a seed phrase, and the password system generates a list of passwords that can be used. The user picks one from the list and submits it along with the seed phrase to gain access.
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Write a statement that prints the number of characters in a String object called overview.
What will be an ideal response?
What is the output of the second println statement in the main method?
``` public class Foo { int i; static int s; public static void main(String[] args) { Foo f1 = new Foo(); System.out.println("f1.i is " + f1.i + " f1.s is " + f1.s); Foo f2 = new Foo(); System.out.println("f2.i is " + f2.i + " f2.s is " + f2.s); Foo f3 = new Foo(); System.out.println("f3.i is " + f3.i + " f3.s is " + f3.s); } public Foo() { i++; s++; } }``` a. f2.i is 1 f2.s is 1 b. f2.i is 1 f2.s is 2 c. f2.i is 2 f2.s is 2 d. f2.i is 2 f2.s is 1
(Reversing a string with Iterators using Recursion) Write a recursive version of Exercise 18.21.
What will be an ideal response?
Mind-mapping is when a group meets with the common goal of finding the best solution to a problem by approaching it from many angles.
Answer the following statement true (T) or false (F)