Question 1

a.(b.c) = (a.b).c is the representation for which property?

Accepted Answer

A) g-ii 
B) g-iii 
C) r-ii 
D) r-iii 
A) g-ii 
B) g-iii 
C) r-ii 
D) r-iii A

Question 2

Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis.

Accepted Answer

A) random polyalphabetic , plaintext , playfair 
B) random polyalphabetic , playfair , vignere 
C) random polyalphabetic , vignere , playfair , plaintext 
D) random polyalphabetic , plaintext , beaufort , playfair 
A) random polyalphabetic , plaintext , playfair 
B) random polyalphabetic , playfair , vignere 
C) random polyalphabetic , vignere , playfair , plaintext 
D) random polyalphabetic , plaintext , beaufort , playfair C

Question 3

a(b+c) = ac+bc is the representation for which property?

Accepted Answer

A) g-ii 
B) g-iii 
C) r-ii 
D) r-iii 
A) g-ii 
B) g-iii 
C) r-ii 
D) r-iii D

Question 4

The process of writing the text as rows and read it as columns is known as

Accepted Answer

A) vernam cipher 
B) ceaser cipher 
C) transposition columnar cipher 
D) homophonic substitution cipher 
A) vernam cipher 
B) ceaser cipher 
C) transposition columnar cipher 
D) homophonic substitution cipher

Question 5

Does the set of residue classes (mod 3) form a group with respect to modular addition?

Accepted Answer

A) yes 
B) no 
C) can	 say 
D) insufficient data 
A) yes 
B) no 
C) can	 say 
D) insufficient data

Question 6

Encryption Strength is based on

Accepted Answer

A) strength of algorithm 
B) secrecy of key 
C) length of key 
D) all of the above 
A) strength of algorithm 
B) secrecy of key 
C) length of key 
D) all of the above

Question 7

For the group Sn of all permutations of n distinct symbols, what is the number of elements in Sn?

Accepted Answer

A) n 
B) n-1 
C) 2n 
D) n! 
A) n 
B) n-1 
C) 2n 
D) n!

Question 8

A Ring is said to be commutative if it also satisfies the property

Accepted Answer

A) r-vi 
B) r-v 
C) r-vii 
D) r-iv 
A) r-vi 
B) r-v 
C) r-vii 
D) r-iv

Question 9

Which layer filters the proxy firewall?

Accepted Answer

A) application 
B) network 
C) transport 
D) none of the above 
A) application 
B) network 
C) transport 
D) none of the above

Question 10

Which one is the strong attack mechanism?

Accepted Answer

A) chosen plaintext attack 
B) chosen cipher text 
C) brute force attack 
D) man in the middle attack 
A) chosen plaintext attack 
B) chosen cipher text 
C) brute force attack 
D) man in the middle attack

Question 11

All groups satisfy properties

Accepted Answer

A) g-i to g-v 
B) g-i to g-iv 
C) g-i to r-v 
D) r-i to r-v 
A) g-i to g-v 
B) g-i to g-iv 
C) g-i to r-v 
D) r-i to r-v

Question 12

. Rail Fence Technique is an example of

Accepted Answer

A) substitution 
B) transposition 
C) product cipher 
D) ceaser cipher 
A) substitution 
B) transposition 
C) product cipher 
D) ceaser cipher

Question 13

Public key encryption is advantageous over Symmetric key Cryptography because of

Accepted Answer

A) speed 
B) space 
C) key exchange 
D) key length 
A) speed 
B) space 
C) key exchange 
D) key length

Question 14

On Encrypting "thepepsiisintherefrigerator" using Vignere Cipher System using the keyword "HUMOR" we get cipher text-

Accepted Answer

A) abqdnwewuwjphfvrrtrfzn sdokvl 
B) abqdvmwuwjphfvvyyrf znydokvl 
C) tbqyrvmwuwjphfvvyy rfznydokvl 
D) baiuvmwuwjphfoeiyrf znydokvl 
A) abqdnwewuwjphfvrrtrfzn sdokvl 
B) abqdvmwuwjphfvvyyrf znydokvl 
C) tbqyrvmwuwjphfvvyy rfznydokvl 
D) baiuvmwuwjphfoeiyrf znydokvl

Question 15

The sub key length at each round of DES is

Accepted Answer

A) 32 
B) 56 
C) 48 
D) 64 
A) 32 
B) 56 
C) 48 
D) 64

Question 16

Which one of the following is not a cryptographic algorithm?

Accepted Answer

A) jupiter 
B) blowfish 
C) serpent 
D) none 
A) jupiter 
B) blowfish 
C) serpent 
D) none

Question 17

Interception is an attack on

Accepted Answer

A) availability 
B) confidentiality 
C) integrity 
D) authenticity 
A) availability 
B) confidentiality 
C) integrity 
D) authenticity

Question 18

Like DES, AES also uses Feistel Structure.

Accepted Answer

A) true 
B) false 
C) cannot be determined 
D) none 
A) true 
B) false 
C) cannot be determined 
D) none

Question 19

Biometric authentication works on the basis of

Accepted Answer

A) human characteristics 
B) passwords 
C) smart cards 
D) pin 
A) human characteristics 
B) passwords 
C) smart cards 
D) pin

Question 20

GCD(a,b) = GCD(b,a mod b)

Accepted Answer

A) true 
B) false 
C) cannot be determined 
D) none 
A) true 
B) false 
C) cannot be determined 
D) none

a.(b.c) = (a.b).c is the representation for which property?

Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis.

a(b+c) = ac+bc is the representation for which property?

The process of writing the text as rows and read it as columns is known as

Does the set of residue classes (mod 3) form a group with respect to modular addition?

Encryption Strength is based on

For the group Sn of all permutations of n distinct symbols, what is the number of elements in Sn?

A Ring is said to be commutative if it also satisfies the property

Which layer filters the proxy firewall?

Which one is the strong attack mechanism?

All groups satisfy properties

. Rail Fence Technique is an example of

Public key encryption is advantageous over Symmetric key Cryptography because of

On Encrypting "thepepsiisintherefrigerator" using Vignere Cipher System using the keyword "HUMOR" we get cipher text-

The sub key length at each round of DES is

Which one of the following is not a cryptographic algorithm?

Interception is an attack on

Like DES, AES also uses Feistel Structure.

Biometric authentication works on the basis of

GCD(a,b) = GCD(b,a mod b)

Cryptography and Network Security

Cryptography Key, Algorithm, and Mode of Operation

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Exam 2: Cryptography and Encryption

a.(b.c) = (a.b).c is the representation for which property?

Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis.

a(b+c) = ac+bc is the representation for which property?

The process of writing the text as rows and read it as columns is known as

Does the set of residue classes (mod 3) form a group with respect to modular addition?

Encryption Strength is based on

For the group Sn of all permutations of n distinct symbols, what is the number of elements in Sn?

A Ring is said to be commutative if it also satisfies the property

Which layer filters the proxy firewall?

Which one is the strong attack mechanism?

All groups satisfy properties

. Rail Fence Technique is an example of

Public key encryption is advantageous over Symmetric key Cryptography because of

On Encrypting "thepepsiisintherefrigerator" using Vignere Cipher System using the keyword "HUMOR" we get cipher text-

The sub key length at each round of DES is

Which one of the following is not a cryptographic algorithm?

Interception is an attack on

Like DES, AES also uses Feistel Structure.

Biometric authentication works on the basis of

GCD(a,b) = GCD(b,a mod b)

Cryptography and Network Security

Cryptography Key, Algorithm, and Mode of Operation

Cryptography and Encryption Techniques

Cryptography, Elliptic Curves, and Email Security

Intrusion and Emailinternet Security Techniques

Cybersecurity Concepts: Sftp, Firewall, Malware, and Virus Protection

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