McqMate
| 1. |
In symmetric-key cryptography, the key locks and unlocks the box is |
| A. | same |
| B. | shared |
| C. | private |
| D. | public |
| Answer» A. same | |
| 2. |
The keys used in cryptography are |
| A. | secret key |
| B. | private key |
| C. | public key |
| D. | all of them |
| Answer» D. all of them | |
| 3. |
Cryptography, a word with Greek origins, means |
| A. | corrupting data |
| B. | secret writing |
| C. | open writing |
| D. | closed writing |
| Answer» B. secret writing | |
| 4. |
A transposition cipher reorders (permutes) symbols in a |
| A. | block of packets |
| B. | block of slots |
| C. | block of signals |
| D. | block of symbols |
| Answer» D. block of symbols | |
| 5. |
Network Security provides authentication and access control for resources. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 6. |
Which is not an objective of network security? |
| A. | identification |
| B. | authentication |
| C. | access control |
| D. | lock |
| Answer» D. lock | |
| 7. |
The process of verifying the identity of a user. |
| A. | authentication |
| B. | identification |
| C. | validation |
| D. | verification |
| Answer» A. authentication | |
| 8. |
Which of these is a part of network identification? |
| A. | user id |
| B. | password |
| C. | otp |
| D. | fingerprint |
| Answer» A. user id | |
| 9. |
The process of transforming plain text into unreadable text. |
| A. | decryption |
| B. | encryption |
| C. | network security |
| D. | information hiding |
| Answer» B. encryption | |
| 10. |
An algorithm used in encryption is referred to as cipher. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 11. |
A process of making the encrypted text readable again. |
| A. | decryption |
| B. | encryption |
| C. | network security |
| D. | information hiding |
| Answer» A. decryption | |
| 12. |
A person who enjoys learning details about computers and how to enhance their capabilities. |
| A. | cracker |
| B. | hacker |
| C. | app controller |
| D. | site controller |
| Answer» B. hacker | |
| 13. |
A small program that changes the way a computer operates. |
| A. | worm |
| B. | trojan |
| C. | bomb |
| D. | virus |
| Answer» D. virus | |
| 14. |
An asymmetric-key (or public-key) cipher uses |
| A. | 1 key |
| B. | 2 key |
| C. | 3 key |
| D. | 4 key |
| Answer» B. 2 key | |
| 15. |
We use cryptofraphy term to transform messages to make them secure and immune to |
| A. | change |
| B. | idle |
| C. | attacks |
| D. | defend |
| Answer» C. attacks | |
| 16. |
In cryptography , the original message before being transformmed , is called |
| A. | simple text |
| B. | plain text |
| C. | empty text |
| D. | filled text |
| Answer» B. plain text | |
| 17. |
A straight permutation cipher or a straight p-box has the same number of input as |
| A. | cipher |
| B. | frames |
| C. | outputs |
| D. | bits |
| Answer» C. outputs | |
| 18. |
The man-in-the-middle attack can endanger the security of the diffie-hellman if two parties are not |
| A. | authenticated |
| B. | joined |
| C. | submit |
| D. | separate |
| Answer» A. authenticated | |
| 19. |
Which of the following is not a transport layer vulnerability? |
| A. | mishandling of undefined , poorly defined |
| B. | the vulnerability that allows fingerprinting & other enumeration of host information |
| C. | overloading of transporting layer mechanisms |
| D. | unauthorized network access |
| Answer» D. unauthorized network access | |
| 20. |
Transmission mechanisms can be subject to spoofing & attacks based on skilled modified packets. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 21. |
TCP/IP model does not have layer but OSI model have this layer. |
| A. | session layer |
| B. | transport layer |
| C. | application layer |
| D. | network layer |
| Answer» A. session layer | |
| 22. |
In cryptography, what is cipher? |
| A. | algorithm for performing encrption and decryption |
| B. | encrypted message |
| C. | both algorith for performing encrption and decryption and encrypted message |
| D. | decrypted message |
| Answer» A. algorithm for performing encrption and decryption | |
| 23. |
In cryptography, the order of the letters in a message is rearranged by |
| A. | transpositional ciphers |
| B. | substitution ciphers |
| C. | both |
| D. | quadratic ciphers |
| Answer» A. transpositional ciphers | |
| 24. |
What is data encryption standard (DES)? |
| A. | block cipher |
| B. | stream cipher |
| C. | bit cipher |
| D. | byte cipher |
| Answer» A. block cipher | |
| 25. |
Cryptanalysis is used |
| A. | to find some insecurity in a cryptographic scheme |
| B. | to increase the speed |
| C. | to encrypt the data |
| D. | to make new ciphers |
| Answer» A. to find some insecurity in a cryptographic scheme | |
| 26. |
Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis. |
| A. | random polyalphabetic , plaintext , playfair |
| B. | random polyalphabetic , playfair , vignere |
| C. | random polyalphabetic , vignere , playfair , plaintext |
| D. | random polyalphabetic , plaintext , beaufort , playfair |
| Answer» C. random polyalphabetic , vignere , playfair , plaintext | |
| 27. |
On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text- |
| A. | abqdnwewuwjphfvrrtrfzn sdokvl |
| B. | abqdvmwuwjphfvvyyrf znydokvl |
| C. | tbqyrvmwuwjphfvvyy rfznydokvl |
| D. | baiuvmwuwjphfoeiyrf znydokvl |
| Answer» B. abqdvmwuwjphfvvyyrf znydokvl | |
| 28. |
. Rail Fence Technique is an example of |
| A. | substitution |
| B. | transposition |
| C. | product cipher |
| D. | ceaser cipher |
| Answer» B. transposition | |
| 29. |
Public key encryption is advantageous over Symmetric key Cryptography because of |
| A. | speed |
| B. | space |
| C. | key exchange |
| D. | key length |
| Answer» C. key exchange | |
| 30. |
The sub key length at each round of DES is |
| A. | 32 |
| B. | 56 |
| C. | 48 |
| D. | 64 |
| Answer» B. 56 | |
| 31. |
Which one is the strong attack mechanism? |
| A. | chosen plaintext attack |
| B. | chosen cipher text |
| C. | brute force attack |
| D. | man in the middle attack |
| Answer» C. brute force attack | |
| 32. |
Interception is an attack on |
| A. | availability |
| B. | confidentiality |
| C. | integrity |
| D. | authenticity |
| Answer» B. confidentiality | |
| 33. |
Chosen cipher text attack is based on |
| A. | cryptanalysis |
| B. | cryptography |
| C. | encryption |
| D. | decryption |
| Answer» A. cryptanalysis | |
| 34. |
The process of writing the text as rows and read it as columns is known as |
| A. | vernam cipher |
| B. | ceaser cipher |
| C. | transposition columnar cipher |
| D. | homophonic substitution cipher |
| Answer» C. transposition columnar cipher | |
| 35. |
Biometric authentication works on the basis of |
| A. | human characteristics |
| B. | passwords |
| C. | smart cards |
| D. | pin |
| Answer» A. human characteristics | |
| 36. |
Which layer filters the proxy firewall? |
| A. | application |
| B. | network |
| C. | transport |
| D. | none of the above |
| Answer» A. application | |
| 37. |
Encryption Strength is based on |
| A. | strength of algorithm |
| B. | secrecy of key |
| C. | length of key |
| D. | all of the above |
| Answer» D. all of the above | |
| 38. |
GCD(a,b) = GCD(b,a mod b) |
| A. | true |
| B. | false |
| C. | cannot be determined |
| D. | none |
| Answer» A. true | |
| 39. |
All groups satisfy properties |
| A. | g-i to g-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | r-i to r-v |
| Answer» C. g-i to r-v | |
| 40. |
An Abelian Group satisfies the properties |
| A. | g-i to g-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | r-i to r-v |
| Answer» A. g-i to g-v | |
| 41. |
A Ring satisfies the properties |
| A. | r-i to r-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | g-i to r-iii |
| Answer» D. g-i to r-iii | |
| 42. |
A Ring is said to be commutative if it also satisfies the property |
| A. | r-vi |
| B. | r-v |
| C. | r-vii |
| D. | r-iv |
| Answer» D. r-iv | |
| 43. |
An ‘Integral Domain’ satisfies the properties |
| A. | g-i to g-iii |
| B. | g-i to r-v |
| C. | g-i to r-vi |
| D. | g-i to r-iii |
| Answer» C. g-i to r-vi | |
| 44. |
Does the set of residue classes (mod 3) form a group with respect to modular addition? |
| A. | yes |
| B. | no |
| C. | can\t say |
| D. | insufficient data |
| Answer» A. yes | |
| 45. |
For the group Sn of all permutations of n distinct symbols, what is the number of elements in Sn? |
| A. | n |
| B. | n-1 |
| C. | 2n |
| D. | n! |
| Answer» D. n! | |
| 46. |
a(b+c) = ac+bc is the representation for which property? |
| A. | g-ii |
| B. | g-iii |
| C. | r-ii |
| D. | r-iii |
| Answer» D. r-iii | |
| 47. |
a.(b.c) = (a.b).c is the representation for which property? |
| A. | g-ii |
| B. | g-iii |
| C. | r-ii |
| D. | r-iii |
| Answer» A. g-ii | |
| 48. |
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 |
| Answer» D. 128; 128, 192, or 256 | |
| 49. |
Like DES, AES also uses Feistel Structure. |
| A. | true |
| B. | false |
| C. | cannot be determined |
| D. | none |
| Answer» B. false | |
| 50. |
Which one of the following is not a cryptographic algorithm? |
| A. | jupiter |
| B. | blowfish |
| C. | serpent |
| D. | none |
| Answer» A. jupiter | |
| 51. |
If the key is 110100001, the output of the SP network for the plaintext: 101110001 is |
| A. | 110100011 |
| B. | 110101110 |
| C. | 10110111 |
| D. | 11111010 |
| Answer» B. 110101110 | |
| 52. |
What is the number of possible 3 x 3 affine cipher transformations |
| A. | 168 |
| B. | 840 |
| C. | 1024 |
| D. | 1344 |
| Answer» D. 1344 | |
| 53. |
What is the expanded key size of AES-192? |
| A. | 44 words |
| B. | 60 words |
| C. | 52 words |
| D. | 36 words |
| Answer» C. 52 words | |
| 54. |
In affine block cipher systems if f(m)=Am + t, what is f(m1+m2+m3) ? |
| A. | f(m1) + f(m2) + f(m3) + t |
| B. | f(m1) + f(m2) + f(m3) +2t |
| C. | f(m1) + f(m2) + f(m3) |
| D. | 2(f(m1) + f(m2) + f(m3)) |
| Answer» C. f(m1) + f(m2) + f(m3) | |
| 55. |
The 4×4 byte matrices in the AES algorithm are called |
| A. | states |
| B. | words |
| C. | transitions |
| D. | permutations |
| Answer» A. states | |
| 56. |
If the block size is ‘s’, how many affine transformations are possible ? |
| A. | 2s (2s-1)(2s-1)(2s-12) ………(2s-1(s-1)) |
| B. | 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-2)) |
| C. | 2ss (2s-1)(2s-2)(2s-22) ………(2s-2(s-1)) |
| D. | 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-3)) |
| Answer» C. 2ss (2s-1)(2s-2)(2s-22) ………(2s-2(s-1)) | |
| 57. |
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 |
| Answer» B. 9 ; the last | |
| 58. |
The DES Algorithm Cipher System consists of rounds (iterations) each with a round key |
| A. | 9 |
| B. | 12 |
| C. | 18 |
| D. | 16 |
| Answer» D. 16 | |
| 59. |
DES follows |
| A. | hash algorithm |
| B. | caesars cipher |
| C. | feistel cipher structure |
| D. | sp networks |
| Answer» C. feistel cipher structure | |
| 60. |
Every cyclic group is . |
| A. | a group with finite order |
| B. | a group with prime order |
| C. | a non abelian group |
| D. | an abelian group |
| Answer» D. an abelian group | |
| 61. |
In the DES algorithm the round key is bit and the Round Input is bits |
| A. | 48, 32 |
| B. | 64,32 |
| C. | 56, 24 |
| D. | 32, 32 |
| Answer» A. 48, 32 | |
| 62. |
is not a binary operation on the set of natural numbers. |
| A. | addition |
| B. | product |
| C. | difference |
| D. | none |
| Answer» C. difference | |
| 63. |
In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via |
| A. | scaling of the existing bits |
| B. | duplication of the existing bits |
| C. | addition of zeros |
| D. | addition of ones |
| Answer» A. scaling of the existing bits | |
| 64. |
Which of the following is group under multiplication? |
| A. | q |
| B. | q-{0} |
| C. | q-{1} |
| D. | q-{0,1} |
| Answer» B. q-{0} | |
| 65. |
The Initial Permutation table/matrix is of size |
| A. | 16×8 |
| B. | 4×8 |
| C. | 12×8 |
| D. | 8×8 |
| Answer» D. 8×8 | |
| 66. |
The number of unique substitution boxes in DES after the 48 bit XOR operation are |
| A. | 8 |
| B. | 4 |
| C. | 6 |
| D. | 12 |
| Answer» A. 8 | |
| 67. |
The DES algorithm has a key length of |
| A. | 128 bits |
| B. | 32 bits |
| C. | 64 bits |
| D. | 16 bits |
| Answer» C. 64 bits | |
| 68. |
What is the size of the key in the SDES algorithm? |
| A. | 24 bits |
| B. | 16 bits |
| C. | 20 bits |
| D. | 10 bits |
| Answer» D. 10 bits | |
| 69. |
The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 is |
| A. | 1100111 |
| B. | 110110 |
| C. | 1001000 |
| D. | 1001100 |
| Answer» B. 110110 | |
| 70. |
Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1? |
| A. | 10100100 |
| B. | 1011011 |
| C. | 1101000 |
| D. | 10100111 |
| Answer» A. 10100100 | |
| 71. |
Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2? |
| A. | 11101010 |
| B. | 11011011 |
| C. | 1101000 |
| D. | 10101111 |
| Answer» A. 11101010 | |
| 72. |
Which of the following is a mode of operation for the Block ciphers in cryptography? |
| A. | a. electronic code book (ecb) |
| B. | cipher block chaining (cbc) |
| C. | counter (ctr) mode |
| D. | all of the above |
| Answer» D. all of the above | |
| 73. |
Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers? |
| A. | a. cbc (cipher block chaining) |
| B. | ecb (electronic code book) |
| C. | a. cfb (cipher text feed back) |
| D. | all of the above |
| Answer» C. a. cfb (cipher text feed back) | |
| 74. |
The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is |
| A. | 1100111 |
| B. | 1010 |
| C. | 11111111 |
| D. | 1101101 |
| Answer» C. 11111111 | |
| 75. |
Which one of the following RC4 algorithm not used in? |
| A. | ssl |
| B. | tls |
| C. | ftp |
| D. | wep |
| Answer» C. ftp | |
| 76. |
Till when was the RC4 algorithm kept a secret? |
| A. | 1990 |
| B. | 1992 |
| C. | 1996 |
| D. | 1994 |
| Answer» D. 1994 | |
| 77. |
The Plaintext for the Ciphertext 00100010, given that the key is 1111111111 is |
| A. | 1100111 |
| B. | 1010 |
| C. | 1001000 |
| D. | 1001100 |
| Answer» D. 1001100 | |
| 78. |
The man-in-the-middle attack can endanger the security of the Diffie-Hellman method if two parties are not |
| A. | authenticated |
| B. | joined |
| C. | submit |
| D. | separate |
| Answer» A. authenticated | |
| 79. |
RSA is also a stream cipher like Merkel-Hellman |
| A. | true |
| B. | false |
| Answer» A. true | |
| 80. |
Rabin Cryptosystem is a variant of the Elgamal Cryptosystem |
| A. | true |
| B. | false |
| Answer» B. false | |
| 81. |
In RSA, Ф(n) = in terms of p and q |
| A. | (p)/(q) |
| B. | (p)(q) |
| C. | (p-1)(q-1) |
| D. | (p+1)(q+1) |
| Answer» C. (p-1)(q-1) | |
| 82. |
In Asymmetric Key Cryptography, the two key, e and d, have a special relationship to |
| A. | others |
| B. | data |
| C. | keys |
| D. | each other |
| Answer» D. each other | |
| 83. |
Using Rabin cryptosystem with p=23 and q=7 ,Encrypt P=24 to find ciphertext. The Cipher text is |
| A. | 42 |
| B. | 93 |
| C. | 74 |
| D. | 12 |
| Answer» D. 12 | |
| 84. |
For RSA to work, the value of P must be less than the value of |
| A. | p |
| B. | q |
| C. | n |
| D. | f |
| Answer» C. n | |
| 85. |
Session keys are transmitted after being encrypted by |
| A. | make-shift keys |
| B. | temporary keys |
| C. | master keys |
| D. | section |
| Answer» C. master keys | |
| 86. |
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. | whirlpool |
| Answer» A. elgamal | |
| 87. |
The certificate message is required for any agreed-on key exchange method except |
| A. | ephemeral diffie- hellman |
| B. | anonymous diffie- hellmanc |
| C. | fixed diffie- hellmand. |
| D. | rsa |
| Answer» B. anonymous diffie- hellmanc | |
| 88. |
Sender chooses p = 107, e1 = 2, d = 67, and the random integer is r=45. Find the plaintext to be transmitted if the ciphertext is (28,9) |
| A. | 45 |
| B. | 76 |
| C. | 66 |
| D. | 13 |
| Answer» C. 66 | |
| 89. |
In Asymmetric key Cryptography, although RSA can be used to encrypt and decrypt actual messages, it is very slow if the message is |
| A. | short |
| B. | long |
| C. | flat |
| D. | thin |
| Answer» B. long | |
| 90. |
Which of the following is not a type of symmetric-key cryptography technique? |
| A. | caesar cipher |
| B. | data encryption standard (des) |
| C. | diffie hellman cipher |
| D. | playfair cipher |
| Answer» C. diffie hellman cipher | |
| 91. |
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 |
| Answer» C. 25 | |
| 92. |
How many bytes of the secret key is generated using Diffie-Hellman encryption/decryption scheme? |
| A. | 256 |
| B. | 871 |
| C. | 1024 |
| D. | 962 |
| Answer» A. 256 | |
| 93. |
Computation of the discrete logarithm is the basis of the cryptographic system |
| A. | symmetric cryptography |
| B. | asymmetric cryptography |
| C. | diffie-hellman key exchange |
| D. | secret key cryptography |
| Answer» C. diffie-hellman key exchange | |
| 94. |
In Elgamal cryptosystem, given the prime p=31,Encrypt the message “HELLO”; use 00 to 25 for encoding. The value of C2 for character ‘O’ is |
| A. | 9 |
| B. | 7 |
| C. | 23 |
| D. | 27 |
| Answer» A. 9 | |
| 95. |
What is the block size of RC6 Feistel block cipher? |
| A. | 5013 bits |
| B. | 128 bits |
| C. | 596 bits |
| D. | 1768 bits |
| Answer» B. 128 bits | |
| 96. |
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 |
| Answer» D. y2+b_1 xy+b_2 y=x3+a_1 x2+a_2 x+a_3 | |
| 97. |
USENET falls under which category of public key sharing? |
| A. | public announcement |
| B. | publicly available directory |
| C. | public-key authority |
| D. | public-key certificates |
| Answer» A. public announcement | |
| 98. |
In Singular elliptic curve, the equation x^3+ax+b=0 does roots |
| A. | does not have three distinct |
| B. | has three distinct |
| C. | has three unique |
| D. | has three distinct unique |
| Answer» A. does not have three distinct | |
| 99. |
The value of 52003 mod 7 is(use fermat's theorem) |
| A. | 3 |
| B. | 4 |
| C. | 8 |
| D. | 9 |
| Answer» A. 3 | |
| 100. |
Elliptic curve cryptography follows the associative property |
| A. | true |
| B. | false |
| Answer» A. true | |
Done Reading?