Chapter 2 QUIZ

When carrying out asymmetric encryption , which of the following users would keep the private key.

• sender

• receiver

• all members

• none of above

Which of the following is the final number in the code , which is calculated from rest of the numbers in the code.

• Parity Check

• CheckSum

• Checkdigit

• EchoCheck

Which of the following statements about asymmetric encryption is true? Circle the correct answer.

• uses a public key only

• uses both public and private key

• always uses 64 bit encryption

• none of above

Using an algorithm for ISBN- 13, calculate the CheckDigit for:

978151045759

• 2

• 3

• 1

• 5

Find the Check Digit using Modulo 11 method.

213111000428

(note that step of weights assigning, will change as per length of the number)

• 5

• 6

• 7

• 10

In encryption, which of the following is the term used to describe the message before it is encrypted. Choose correct answer.

• Simpletext

• plaintext

• notext

• ciphertext

Which of the following methods uses an extra bit , added to a byte to ensure it contains an even number of 1's or odd number of 1's ? Choose correct answer.

• CRC

• ECHO

• PARITY

• ARQ

Select 1 OR 0 , EVEN PARITY is followed for following: 1101100

• 0

• 1

Explain the problem with Parity Check.

• Security Issues

• Encryption Issues

• Bit parity not set

• will not work if 2 bits corrupted.

One of the bits has been transmitted incorrectly. Indicate which bit is incorrect by giving its bit number and byte number.

• byte 3 , bit 4

• byte 7 , bit 8

• byte 8 , bit 7

• byte 6 , bit 5