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MODEL TEST I

Total questions: 100

Worksheet time: 25hrs 0mins

Name
Class
Date
1.

Use Caesar’s Cipher to decipher the following

HQFUBSWHG WHAW

a)

ABANDONED LOCK

b)

ENCRYPTED TEXT

c)

ABANDONED TEXT

d)

ENCRYPTED LOCK

2.

On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text

a)

abqdnwewuwjphfvrrtrfznsdokvl

b)

abqdvmwuwjphfvvyyrfznydokvl

c)

tbqyrvmwuwjphfvvyyrfznydokvl

d)

baiuvmwuwjphfoeiyrfznydokvl

3.

Monoalphabetic ciphers are stronger than Polyalphabetic ciphers because frequency analysis is tougher on the former.

a)

True

b)

False

4.

In brute force attack, on average half of all possible keys must be tried to achieve success.

a)

True

b)

False

5.

If the sender and receiver use different keys, the system is referred to as conventional cipher system.

a)

True

b)

False

6.

An encryption scheme is unconditionally secure if the ciphertext generated does not contain enough information to determine uniquely the corresponding plaintext, no matter how much cipher text is available.

a)

True

b)

False

7.

_______________________ is a term used in cryptography that refers to a message before encryption or after decryption.

a)

Cipher Text

b)

Plain Text

8.

A ________ cipher replaces one character with another character.

a)

substitution

b)

transposition

9.

________ is the science and art of transforming messages to make them secure and immune to attacks.

a)

Cryptography

b)

Cryptoanalysis

10.

In a(n) ________ cipher, the same key is used by both the sender and receiver.

a)

symmetric-key

b)

Asymmetric-key

11.

The _______ is a number or a set of numbers on which the cipher operates.

a)

cipher

b)

secret

c)

key

d)

none of the above

12.

The substitution ciphers are

a)

monoalphabetic

b)

polyalphabetic

c)

ceaser

d)

all the above

13.

Cryptography algorithms are divided into

a)

2 groups

b)

3 groups

c)

1 groups

14.

A Substitution cipher replaces one symbol with

a)

same symbol

b)

provide 2 symbols for each

c)

another

d)

all of them

15.

Cryptography ,a word with Greek origins, means

a)

Corrupting Data

b)

Secret Writing

c)

Open Writing

d)

Closed Writing

16.

Cryptography can provide,

a)

entity authentication

b)

non repudiation of messages

c)

confidentiality

d)

all of them

17.

The art of breaking the code is

a)

cryptosystem

b)

Cryptography

c)

Steganography

d)

Cryptanalysis

18.

One time pad is also known as,

a)

Perfect Secrecy

b)

Perfect Hiding

c)

Perfect Writing

19.

Which of the following are active attacks

a)

masquerade

b)

replay

c)

interception

d)

interruption

20.

Transposition techniques are

a)

rail fence

b)

doubler columnar

c)

none

21.

Is S a ring from the following multiplication and addition tables?

+ a b x a b

a a b a a a

b b a b a b

a)

Yes

b)

No

22.

Calculate the GCD of 1160718174 and 316258250 using Euclidean algorithm.

a)

882

b)

770

c)

1078

d)

1225

23.

Which of the following is a valid property for concurrency?

a)

a = b (mod n) if n|(a-b)

b)

a = b (mod n) implies b = a (mod n)

c)

a = b (mod n) and b = c (mod n) implies a = c (mod n)

24.

11^7 mod 13 =

a)

3

b)

7

c)

5

d)

15

25.

For Modular Arithmetic what value is the most important?

a)

The Modulo

b)

The Given Number

c)

The Remainder

d)

The Divisor

26.

What does 36 mod 13 look like using the Quotient Remainder Theorem?

a)

36 = 13 * 2 + 10

b)

36 = 10 * 3 + 6

c)

13 = 36 * 1 - 23

d)

6 = 36 - 10 * 3

27.

Euclid’s algorithm is used for finding ___________

a)

GCD of two numbers

b)

GCD of more than three numbers

28.

Which of the following is not an application of Euclid’s algorithm?

a)

Simplification of fractions

b)

Performing divisions in modular arithmetic

c)

Solving quadratic equations

d)

Solving diophantine equations

29.

What is the total running time of Euclid’s algorithm?

a)

O(N)

b)

O(N log M)

c)

O(N log N)

d)

O(log N +1)

30.

ᶲ(35)=

a)

24

b)

25

c)

22

d)

18

31.

The number of tests required to break the DES algorithm are

a)

2.8×1014

b)

4.2×109

c)

1.84×1019

d)

7.2×1016

32.

In triple DES, the key size is ___ and meet in the middle attack takes ___ tests to break the key.

a)

2192 ,2112

b)

2184,2111

c)

2168,2111

d)

2168,2112

33.

The code bellow is the RC5 encryption pseudo code in C language.

What is the error?

LE0 = A + S[0];

RE0 = B + S [1];

for i = 1 to r do

LEi = ((LEi-1 ⊕ REi-1) >>> REi-1) + S [2xi];

REi = ((REi-1 ⊕ LEi) <<< LEi) + S [2xi+1];

a)

The left shift operation (should be right shift)

b)

The right shift operation (should be left shift)

c)

LEi-1 and REi-1 should be LEi and REi

d)

The for loop runs from 1 to r-1 ( not 1 to r)

34.

Which of these is not a characteristic of block ciphers?

a)

Variable key length / block size / number of rounds

b)

Mixed operators, data/key dependent rotation

c)

Key independent S-boxes

d)

More complex key scheduling

35.

AES uses a ____________ bit block size and a key size of __________ bits.

a)

128; 128 or 256

b)

64; 128 or 192

c)

256; 128, 192, or 256

d)

128; 128, 192, or 256

36.

The 4×4 byte matrices in the AES algorithm are called

a)

States

b)

Words

c)

Transitions

d)

Permutations

37.

For the AES-128 algorithm there are __________ similar rounds and _________ round is different.

a)

2 pair of 5 similar rounds ; every alternate

b)

9 ; the last

c)

8 ; the first and last

d)

10 ; no

38.

On encrypting MANIPALINSTITUTE with key ADVANCEDENCRYPTI we get the state matrix –

a)

FC 1D 1B 0D

15 02 1D 05

10 0F 17 00

20 0D 1B FC

b)

FC 1D 1B 0D

15 02 1D 05

10 0F 17 00

20 0D 1B 0C

c)

OC FE 0B 0D

D5 02 1D 05

18 09 17 00

08 0D 1B FC

d)

OC 1E 0B 0D

05 02 1D 05

18 09 17 00

08 0D 1B 0C

39.

On perform the Mix Columns transformation for the sequence of bytes “77 89 AB CD” we get output

a)

{01 55 EE 4A}

b)

{0A 44 EF 4A}

c)

{08 55 FF 3A}

d)

{09 44 DD 4A}

40.

“Meet in the middle attack” is an attack

a)

where the timing required for the attack via brute force is drastically reduced

b)

where the adversary uses 2 or more machines to decrypt thus trying to reduce the time

c)

where messages are intercepted and then either relayed or substituted with another message

d)

where cryptanalysis takes lesser time than the brute force decryption

41.

__ is the method for keeping sensitive information in email communication & accounts secure against unofficial access, loss, or compromise.

a)

Email security

b)

Email hacking

c)

Email protection

d)

Email safeguarding

42.

If a website uses a cookie, or a browser contains the cookie, then every time you visit that website, the browser transfers the cookie to that website.

a)

True

b)

False

43.

Which of the following symmetric encryption algorithms is/are supported in S/MIME?

a)

RSA

b)

DES

c)

3DES

d)

SHA 1

44.

Which of the following programs is used by a user to send and receive emails?

a)

Mail Transfer agent

b)

Mail Delivery Agent

c)

Mail User Agent

d)

Mail Reading Agent

45.

Pretty good privacy (PGP) security system uses

a)

Public key cryptosystem

b)

Private key cryptosystem

c)

Public & Private key cryptosystem

d)

None of the mentioned

46.

PGP offers ___ block ciphers for message encryption.

a)

Triple-DES

b)

CAST

c)

IDEA

d)

All of the mentioned

47.

Which block cipher has key length of 128 bits?

a)

IDEA

b)

CAST

c)

IDEA & CAST

d)

None

48.

S/MIME is abbreviated as ______

a)

Secure/Multimedia Internet Mailing Extensions

b)

Secure/Multipurpose Internet Mailing Extensions

c)

Secure/Multimedia Internet Mail Extensions

d)

Secure/Multipurpose Internet Mail Extensions

49.

___ uniquely identifies the MIME entities uniquely with reference to multiple contexts.

a)

Content description.

b)

Content -id.

c)

Content type.

d)

Content transfer encoding.

50.

______ is set of protocols designed to support secure exchange of packets.

a)

SSL

b)

PGP

c)

IPSec

d)

None

51.

IPSec is designed to provide security at ________ level

a)

Transport

b)

Network

c)

Application

d)

Session

52.

IPsec defines two protocols ________ and ________

a)

AH & SSL

b)

PGP & ESP

c)

AH & ESP

d)

None

53.

_________ provides either authentication or encryption, or both, for packets at IP level.

a)

AH

b)

PGP

c)

ESP

d)

SSL

54.

The _______ mode is normally used when we need host to host protection of data

a)

Transport

b)

Tunnel

55.

______ is protocol designed to create security associations.

a)

IKE

b)

SA

c)

KDC

56.

IPSec in the tunnel mode does not protect the IP header

a)

TRUE

b)

FALSE

57.

Pick out wrong statement


i) ESP can encrypt payload data and padding.


ii)ESP does not provide confindentiality.


iii) ESP can have Integrity check value for integrity purpose.


iv) ESP gives Initialization value at start of payload.

a)

I

b)

II

c)

III

d)

IV

58.

______ provides symmetric key for sender and receiver

a)

AH

b)

IKE

c)

ESP

d)

SA

59.

IPSec uses a set of SA's called the _________

a)

SAD

b)

SADB

c)

SAB

60.

In tunnel mode, IPSec protects the ______

a)

Entire IP packet

b)

IP header

c)

IP payload

d)

IP trailer

61.

In public key cryptosystem _____ keys are used for encryption and decryption.

a)

SAME

b)

DIFFERENT

62.

In public key cryptosystem which is kept as public?

a)

Encryption keys

b)

Decryption keys

63.

In a trapdoor function, the functions are easy to go in

a)

1 direction

b)

2 direction

c)

all direction

64.

Merkle hellman is a symmetric cryptosystem

a)

true

b)

false

65.

3^201 mod 11 =

a)

3

b)

5

c)

6

d)

10

66.

Find x for the CRT when x= 2 mod 3; x= 3 mod 5; x = 2 mod 7

a)

33

b)

23

c)

22

d)

31

67.

How many primitive roots are there for 25?

a)

4

b)

5

c)

7

d)

8

68.

Another name for Merkle-Hellman Cryptosystem is

a)

RC4

b)

Knapsack

c)

Rijndael

d)

Diffie-Hellman

69.

“Elliptic curve cryptography follows the associative property.”

a)

true

b)

false

70.

In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?

a)

p and q should be divisible by Ф(n)

b)

p and q should be co-prime

c)

p and q should be prime

d)

p/q should give no remainder

71.

Which Cryptographic system uses C1 = (e1r) mod p and C1 = (e2r x P) mod p at the encryption side?

a)

Elgamal

b)

RSA

c)

Rabin

d)

Whirpool

72.

In Elgamal cryptosystem, given the prime p=31.Choose e1= first primitive root of p and d=10, calculate e2

a)

24

b)

36

c)

25

d)

62

73.

What is the general equation for elliptic curve systems?

a)

y3+b_1 xy+b_2 y=x33+a_1 x2+a_2 x+a_3

b)

y3+b_1 x+b_2 y=x2+a_1 x2+a_2 x+a_3

c)

y2+b_1 xy+b_2 y=x3+a_1 x2+a_2

d)

y2+b_1 xy+b_2 y=x3+a_1 x2+a_2 x+a_3

74.

Which one of the following algorithm is not used in asymmetric-key cryptography?

a)

RSA

b)

Diffie - Hellman

c)

ECB Algorithm

d)

DSA

75.

RSA stands for

a)

Rivest,Shamir,Adleman

b)

Roger,Shamir,Adiran

c)

Robert,Shamir,Anthoney

76.

Which system uses a trusted third party interface?

a)

Public-Key Certificates

b)

Public announcements

c)

Publicly available directories

d)

Public-Key authority

77.

In Public key encryption if A wants to send an encrypted message

a)

A encrypted message using his private key

b)

A encrypted message using B's private key

c)

A encrypted message using B's public key

78.

For p = 11 and q = 19 and choose e=17. Apply RSA algorithm where message=5 and find the cipher text.

a)

80

b)

92

c)

56

d)

23

79.

For p = 11 and q = 19 and choose d=17. Apply RSA algorithm where Cipher message=80 and thus find the plain text.

a)

54

b)

43

c)

5

d)

24

80.

In an RSA system the public key of a given user is e = 31, n = 3599. What is the private key of this user?

a)

3031

b)

2412

c)

2432

d)

1023

81.

Message authentication code is also known as

a)

key code

b)

hash code

c)

keyed hash function

d)

message key hash function

82.

Which one of the following is not an application hash functions?

a)

One-way password file

b)

Key wrapping

c)

Virus Detection

d)

Intrusion detection

83.

SHA-1 produces a hash value of

a)

256 bits

b)

160 bits

c)

180 bits

d)

128 bits

84.

What does the figure represent?

a)

Compression function

b)

Message digest generation using SHA

c)

Elementary SHA operation for single round

d)

Processing of a single 1024 bit block

85.

What is the number of operation required to come up with 2 messages having the same message digest in SHA-512?

a)

2^256

b)

2^512

c)

2^1024

d)

2^128

86.

------------means to prove the identity of the entity that tries to access the system resources

a)

message authentication

b)

entity authentication

c)

message confidentiality

d)

none

87.

A ------- signature is included in the document; a -------- signature is a separate entity

a)

conventional;digital

b)

digital;digital

c)

either (a) or (b)

d)

neither (a) or (b)

88.

Digital Signature provides --------

a)

authentication

b)

non repudiation

c)

both (a) or (b)

d)

neither (a) or (b)

89.

Digital Signature cannot provide -------- for the message

a)

integrity

b)

confidentiality

c)

non repudiation

d)

authentication

90.

A witness used in the entity authentication is ---------

a)

something known

b)

something possessed

c)

something inherent

d)

all the above

91.

Password based authentication can be divided into two broad categories: ---------- and ----------

a)

fixed;variable

b)

time-stamped;fixed

c)

fixed;one-time

d)

none

92.

Challenge response authentication can be done using

a)

symmetric key ciphers

b)

asymmetric key ciphers

c)

keyed hash functions

d)

all of the above

93.

The secret key between members needs to be created as a ------ key when two members contact KDC

a)

public

b)

session

c)

complimentary

d)

none

94.

---------------- is a popular session key creator protocol that requires an authentication server and a ticket granting server

a)

KDC

b)

Kerberos

c)

CA

d)

None

95.

----------------is a federal or state organization that binds a public key to an entity and issues a certificate

a)

KDC

b)

Kerberos

c)

CA

d)

None

96.

Which of the following is not a property of Hash Function?

a)

Pre-Image Resistance

b)

Compression

c)

Fixed Length Output

d)

None of the above

97.

Which of the following options is not correct according to the definition of the Hash Function?

a)

Hash Functions are mathematical functions

b)

They compress the input values

c)

The hash functions work on arbitrary length input but produces fixed length output.

d)

None of the above

98.

"The Hash Function takes an input of arbitrary length and converts it into a fixed length output."

Which of the following names can we use for denoting the output of the hash function?

a)

Hash value

b)

Hash Code

c)

Message Digest

d)

All of the above

99.

The above figure implements authentication and signature only?

a)

true

b)

false

100.

The above figure represents internal error control.

a)

true

b)

false

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