McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) .
| 51. |
DES stands for ________________. |
| A. | Device Encryption Standard |
| B. | Data Encrypted Standard |
| C. | Data Encryption Security |
| D. | Data Encryption Standard |
| Answer» D. Data Encryption Standard | |
| 52. |
____________ carries out all its calculations on bytes rather than using bits and is at least 6-times faster than 3-DES. |
| A. | Twofish |
| B. | IDEA |
| C. | DES |
| D. | AES |
| Answer» D. AES | |
| 53. |
AES stands for ________________. |
| A. | Active Encryption Standard |
| B. | Advanced Encrypted Standard |
| C. | Advanced Encryption Standar |
| D. | D Advanced Encryption Security |
| Answer» C. Advanced Encryption Standar | |
| 54. |
AES is at least 6-times faster than 3-DES. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 55. |
_____________ is another data hiding technique which can be used in conjunction with cryptography for the extra-secure method of protecting data. |
| A. | Chorography |
| B. | Tomography |
| C. | Steganography |
| D. | Cryptography |
| Answer» C. Steganography | |
| 56. |
_____________ is hiding of data within data, where we can hide images, text, and other messages within images, videos, music or recording files. |
| A. | Steganography |
| B. | Cryptography |
| C. | Chorography |
| D. | Tomography |
| Answer» A. Steganography | |
| 57. |
Steganography follows the concept of security through obscurity. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 58. |
The word ________________is a combination of the Greek words ‘steganos’ which means “covered or concealed”, and ‘graphein’ which means “writing”. |
| A. | Tomography |
| B. | Chorography |
| C. | Steganography |
| D. | Cryptography |
| Answer» C. Steganography | |
| 59. |
Which of the following is not a steganography tool? |
| A. | Steghide |
| B. | ReaperExploit |
| C. | Image steganography |
| D. | Xaio steganography |
| Answer» B. ReaperExploit | |
| 60. |
Which of the following is not a steganography tool? |
| A. | rSteg |
| B. | Crypture |
| C. | SteganographX Plus |
| D. | Burp Suite |
| Answer» D. Burp Suite | |
| 61. |
The main motive for using steganography is that hackers or other users can hide a secret message behind a ______________. |
| A. | Program file |
| B. | Special file |
| C. | Ordinary file |
| D. | Encrypted file |
| Answer» C. Ordinary file | |
| 62. |
People will normally think it as a normal/regular file and your secret message will pass on without any _______________. |
| A. | Cracking |
| B. | Encryption |
| C. | Suspicion |
| D. | Decryption |
| Answer» C. Suspicion | |
| 63. |
By using ______________ you can diminish the chance of data leakage. |
| A. | Steganography |
| B. | Chorography |
| C. | Tomography |
| D. | Cryptography |
| Answer» A. Steganography | |
| 64. |
Which mode of operation has the worst “error propagation” among the following? |
| A. | EC |
| B. | B CB |
| C. | C CBC |
| D. | OFB |
| Answer» A. EC | |
| 65. |
Which block mode limits the maximum throughput of the algorithm to the reciprocal of the time for one execution? |
| A. | EC |
| B. | B CB |
| C. | C CTR |
| D. | OFB |
| Answer» C. C CTR | |
| 66. |
Which mode requires the implementation of only the encryption algorithm? |
| A. | OF |
| B. | B CTR |
| C. | CBC |
| D. | ECB |
| Answer» B. B CTR | |
| 67. |
Which of the following modes of operation does not involve feedback? |
| A. | OF |
| B. | B CTR |
| C. | CBC |
| D. | ECB |
| Answer» A. OF | |
| 68. |
Which of the following is a natural candidates for stream ciphers? |
| A. | OFB |
| B. | ECB |
| C. | CBC |
| D. | CFB |
| Answer» A. OFB | |
| 69. |
Which one of the following is not a cryptographic algorithm- JUPITER, Blowfish, RC6, Rijndael and Serpent? |
| A. | Rijndael |
| B. | Serpent |
| C. | Blowfish |
| D. | JUPITER |
| Answer» D. JUPITER | |
| 70. |
Which algorithm among- MARS, Blowfish, RC6, Rijndael and Serpent -was chosen as the AES algorithm? |
| A. | Rijndael |
| B. | RC6 |
| C. | Blowfish |
| D. | MARS |
| Answer» D. MARS | |
| 71. |
How many rounds does the AES-192 perform? |
| A. | 16 |
| B. | 12 |
| C. | 14 |
| D. | 10 |
| Answer» B. 12 | |
| 72. |
What is the expanded key size of AES-192? |
| A. | 60 words |
| B. | 32 words |
| C. | 52 words |
| D. | 44 words |
| Answer» C. 52 words | |
| 73. |
The 4×4 byte matrices in the AES algorithm are called_______. |
| A. | Permutations |
| B. | Transitions |
| C. | Words |
| D. | States |
| Answer» D. States | |
| 74. |
In AES the 4×4 bytes matrix key is transformed into a keys of size __________. |
| A. | 60 words |
| B. | 32 words |
| C. | 52 words |
| D. | 44 words |
| Answer» D. 44 words | |
| 75. |
For the AES-128 algorithm there are __________ similar rounds and _________ round is different. |
| A. | 9 ; the last |
| B. | 8 ; the first and last |
| C. | 10 ; no |
| D. | 2 pair of 5 similar rounds ; every alternate |
| Answer» A. 9 ; the last | |
| 76. |
There is an addition of round key before the start of the AES round algorithms. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 77. |
How many computation rounds does the simplified AES consists of? |
| A. | 10 |
| B. | 8 |
| C. | 2 |
| D. | 5 |
| Answer» C. 2 | |
| 78. |
On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function? |
| A. | Permutation P |
| B. | Swapping of halves |
| C. | XOR of subkey with function f |
| D. | F function |
| Answer» B. Swapping of halves | |
| 79. |
What is the block size in the Simplified AES algorithm? |
| A. | 36 bits |
| B. | 16 bits |
| C. | 40 bits |
| D. | 8 bits |
| Answer» C. 40 bits | |
| 80. |
What is the key size in the S-AES algorithm? |
| A. | 32 bits |
| B. | 24 bits |
| C. | 16 bits |
| D. | None of the mentioned |
| Answer» C. 16 bits | |
| 81. |
Which of the following is a faulty S-AES step function? |
| A. | Mix Columns |
| B. | Add round key |
| C. | Byte substitution |
| D. | Shift rows |
| Answer» C. Byte substitution | |
| 82. |
How many step function do Round 1 and 2 each have in S-AES? |
| A. | 1 and 4 |
| B. | 3 and 4 |
| C. | Both 4 |
| D. | 4 and 3 |
| Answer» D. 4 and 3 | |
| 83. |
The inverse transformation matrix times the forward transformation matrix equals the identity matrix. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 84. |
How many round keys are generated in the AES algorithm? |
| A. | 12 |
| B. | 11 |
| C. | 10 |
| D. | 8 |
| Answer» B. 11 | |
| 85. |
DES follows_________. |
| A. | SP Networks |
| B. | Feistel Cipher Structure |
| C. | Caesars Cipher |
| D. | Hash Algorithm |
| Answer» B. Feistel Cipher Structure | |
| 86. |
The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key. |
| A. | 16 |
| B. | 9 |
| C. | 12 |
| D. | 18 |
| Answer» A. 16 | |
| 87. |
The DES algorithm has a key length of ______. |
| A. | 16 Bits |
| B. | 32 Bits |
| C. | 64 Bits |
| D. | 128 Bits |
| Answer» C. 64 Bits | |
| 88. |
In the DES algorithm the round key is __________ bit and the Round Input is ____________bits. |
| A. | 48, 32 |
| B. | 32, 32 |
| C. | 56, 24 |
| D. | 64,32 |
| Answer» A. 48, 32 | |
| 89. |
In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________. |
| A. | Addition of ones |
| B. | Addition of zeros |
| C. | Duplication of the existing bits |
| D. | Scaling of the existing bits |
| Answer» D. Scaling of the existing bits | |
| 90. |
The Initial Permutation table/matrix is of size _____. |
| A. | 4×8 |
| B. | 8×8 |
| C. | 12×8 |
| D. | 16×8 |
| Answer» B. 8×8 | |
| 91. |
The number of unique substitution boxes in DES after the 48 bit XOR operation are___. |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 16 |
| Answer» B. 8 | |
| 92. |
What is the number of possible 3 x 3 affine cipher transformations? |
| A. | 840 |
| B. | 168 |
| C. | 1344 |
| D. | 1024 |
| Answer» C. 1344 | |
| 93. |
The S-Box is used to provide confusion, as it is dependent on the unknown key. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 94. |
For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where PT message=88 and thus find the CT. |
| A. | 64 |
| B. | 11 |
| C. | 54 |
| D. | 23 |
| Answer» B. 11 | |
| 95. |
For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text. |
| A. | 122 |
| B. | 143 |
| C. | 111 |
| D. | 88 |
| Answer» D. 88 | |
| 96. |
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. | 1023 |
| B. | 2432 |
| C. | 2412 |
| D. | 3031 |
| Answer» D. 3031 | |
| 97. |
Compute private key (d, p, q) given public key (e=23, n=233 ´ 241=56,153). |
| A. | 32432 |
| B. | 19367 |
| C. | 12543 |
| D. | 35212 |
| Answer» B. 19367 | |
| 98. |
RSA is also a stream cipher like Merkel-Hellman. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 99. |
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/q should give no remainder |
| B. | p and q should be prime |
| C. | p and q should be co-prime |
| D. | p and q should be divisible by Ф(n) |
| Answer» B. p and q should be prime | |
| 100. |
In RSA, Ф(n) = _______ in terms of p and q. |
| A. | (p+1)(q+1) |
| B. | (p-1)(q-1) |
| C. | (p)(q) |
| D. | (p)/(q) |
| Answer» B. (p-1)(q-1) | |
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