Question

QUESTION 19

1. A key distribution and authentication method used by every operating system. It uses a shared secret key and can also be used for single sign-on operations.

2 points   

QUESTION 20

1. Authentication method that allows a user to authenticate once and use multiple services without having to re-authenticate.

2 points   

QUESTION 21

1. Protocol that establishes the security association for the Authentication Header (AH) or the Encapsulating Security Payload (ESP) in IPsec, and provides keys for both AH and ESP. This is done by providing a method for two hosts to decide upon a shared secret key without transmitting it.

2 points   

QUESTION 22

1. Consider the two Caesar ciphers, C1 and C2, below.

   Plaintext letter: a b c d e f g h i j k l m n o p q r s t u v w x y z  
   C1 (k=5):         f g h i j k l m n o p q r s t u v w x y z a b c d e 
   C2 (k=19):        t u v w x y z a b c d e f g h i j k l m n o p q r s 

   Use these ciphers in the repeating pattern C2, C1, C1, C2 to encrypt the following word:

   cyber

4 points   

QUESTION 23

1. Which of the following are stream ciphers?

   		DES
   		3DES
   		AES
   		RC4

4 points   

QUESTION 24

1. Which of the following is used to sign a certificate created by a CA?

   	a.	CA's public key
   	b.	CA's private key
   	c.	CA's digital signature
   	d.	CA's certificate

4 points   

QUESTION 25

1. Bob wants to send a private message to Alice, so he encrypts the message with

   	a.	Alice's private key
   	b.	Alice's public key
   	c.	Bob's private key
   	d.	Bob's public key

Answer 1

Solution

19)
Keyberos

20)
Single Sign On(SSO)

21)
Internet Key Exchange(IKE)

22)

vdgxk

Explanation

22)

c	y	b	e	r
C2	C1	C1	C1	C2
v	d	g	x	k

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