Paper 2 CS · UNIT 09 · MOCK TEST

Mock 12 – Wireless, Mobile & Network Security (Part 2)

Unit 9: Data Communication and Computer Networks · 22 questions · about 26 minutes. Press End Mock any time to see your score and the correct answers.

All 13 topic-wise mocks in this unit

0 / 22 answered 00:00

Q1.

Arrange the following in the correct order which respect to key generation for RSA algorithm. 1 < e < λ

A. Choose an integer e such that (n) n = p∗q

B. Compute Key length d 1/e

C. Find which is equal to p q

D. Choose two large prime numbers and λ(n)

E. Compute

Choose the correct answer from the options given below:

AA-B-C-D-E BD-C-B-E-A CD-B-E-A-C DA-B-D-E-C

Q2.

Match List I with List II

Aa-III, b-IV, c-II, d-I Q Ba-III, b-IV, c-I, d-II Ca-II, b-III, c-IV, d-I Da-II, b-I, c-IV, d-III

Q3.

Using RSA with p = 13, q = 5 and e = 7, the value of d and the cipher value of '6' with key (e, n) are

A7, 4 B7, 1 C7, 46 D55, 1

Q4.

Match List I with List II. List I: (A) DES, (B) AES, (C) 3DES, (D) RSA. List II: (I) Key size 256, (II) Key size 1024, (III) Key size 56, (IV) Key size 168.

A(A)-(I), (B)-(II), (C)-(IV), (D)-(III) B(A)-(III), (B)-(I), (C)-(IV), (D)-(II) C(A)-(III), (B)-(IV), (C)-(II), (D)-(I) D(A)-(IV), (B)-(II), (C)-(III), (D)-(I)

Q5.

A message is encrypted using public key cryptography to send a message from sender to receiver. Which one of the following statements is True?

ASender encrypts using receiver’s public key BSender encrypts using his own public key CReceiver decrypts using sender’s public key DReceiver decrypts using his own public key

Q6.

Using RSA with p = 3, q = 11 and d = 7, find the value of e and encrypt the number 19.

A20,19 B33,11 C3,28 D77,28

Q7.

Which among the following statement(s) is (are) true?

(A) A hash function takes a message of arbitrary length and generates a fixed length code.

(B) A hash function takes a message of fixed length and generates a code of variable length.

A(A) only B(B) and (C) only C(A) and (C) only D(B) only G G

Q8.

Given below are two statements:

Statement I: In Ceasar Cipher each letter of Plain text is replaced by another letter for encryption.

Statement II: The Diffie-Hellman algorithm is used for the exchange of secret keys. In the light of the above statements, choose the correct answer from the options given below

ABoth Statement I and Statement II are true BBoth Statement I and Statement II are false CStatement I is correct but Statement II is false DStatement I is incorrect but Statement II is true

Q9.

Which of the following is not needed by an encryption algorithm used in Cryptography?

AKEY BMessage CCiphertext DUser details

Q10.

Piconet is a basic unit of a bluetooth system consisting of------------ master node and up to ---- ---------- active slave nodes.

Aone, five Bone, seven Ctwo, eight Done, eight

Q11.

Consider the following statements with respect to network security :

(a) Message confidentiality means that the sender and the receiver expect privacy.

(b) Message integrity means that the data must arrive at the receiver exactly as they were sent.

(c) Message authentication means the receiver is ensured that the message is coming from the intended sender. Which of the statements is (are) correct?

AOnly (a) and (b) BOnly (a) and (c) COnly (b) and (c) D(a), (b) and (c)

Q12.

The Data Encryption Standard (DES) has a function consists of four steps. Which of the following is correct order of these four steps?

Aan expansion permutation, S-boxes, an XOR operation, a straight permutation Ban expansion permutation, an XOR operation, S-boxes, a straight permutation Ca straight permutation. S-boxes, an XOR operation, an expansion permutation Da straight permutation, an XOR operation, S- boxes, an expansion permutation Directions (91-95) Read the following passage and answer the given questions. A flow graph F with entry node (1) and exit node (11) is shown below :

Q13.

In the TCP/IP model, encryption and decryption are functions of the ____ layer.

AData link BNetwork CTransport DApplication

Q14.

The RSA encryption algorithm also works in reverse, that is, you can encrypt a message with the private key and decrypt it using the public key. This property is used in

Aintrusion detection systems Bdigital signatures Cdata compression Dcertification

Q15.

Match the following Secret Key Algorithms (List I) with the Corresponding Key Lengths (List II) and choose the correct answer from the code given below.

A(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) B(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) C(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) D(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Q16.

The Third Generation mobile phones are digital and based on

AAMPS BD-AMPS CCDMA DBroadband CDMA

Q17.

Which of the following statement/s is/are true?

(i) Firewalls can screen traffic going into or out of an organization.

(ii) Virtual private networks can simulate an old leased network to provide certain desirable properties.

A(i) only B(ii) only CBoth (i) and (ii) DNeither (i) nor (ii)

Q18.

Which of the following statements are true ?

(a) Advanced Mobile Phone System (AMPS) is a second generation cellular phone system.

(b) IS - 95 is a second generation cellular phone system based on CDMA and DSSS.

A(a) and (b) only B(b) and (c) only C(a), (b) and (c) D(a) and (c) only

Q19.

Match the following symmetric block ciphers with corresponding block and key sizes :

Aa- iv, b-ii, c-i, d-iii Ba- ii, b-iv, c-i, d-iii Ca- ii, b-iv, c-iii, d-i Da- iv, b-ii, c-iii, d-i

Q20.

In Challenge-Response authentication the claimant ________.

AProves that she knows the secret without revealing it BProves that she doesn’t know the secret CReveals the secret DGives a challenge

Q21.

Decrypt the message “WTAAD” using the Caesar Cipher with key=15.

ALIPPS BHELLO COLLEH DDAATW

Q22.

Encrypt the message "HELLO MY DEARZ" using a transposition cipher with key: plaintext positions 2 4 1 3 → ciphertext positions 1 2 3 4.

AHLLEO YM AEDRZ BEHOLL ZYM RAED CELHL MDOY AZER DELHL DOMY ZAER

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