MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Cryptography and Network Security knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?a) 11101010b) 11011011c) 01101000d) 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 is |
| A. | 11101010b) 11011011c) 01101000d) 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 isa) 01100111 |
| B. | 11011011c) 01101000d) 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 isa) 01100111b) 00110110 |
| C. | 01101000d) 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 isa) 01100111b) 00110110c) 01001000 |
| D. | 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 isa) 01100111b) 00110110c) 01001000d) 01001100View Answer |
| Answer» B. 11011011c) 01101000d) 10101111 12.The Plaintext for the Ciphertext 10100101, given that the key is 0010010111 isa) 01100111b) 00110110 | |
| 2. |
The Plaintext for the Ciphertext 11110000, given that the key is 0000000000 is |
| A. | 01100111 |
| B. | 00000000 |
| C. | 01001000 |
| D. | 01101100 |
| Answer» C. 01001000 | |
| 3. |
The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is |
| A. | 01100111 |
| B. | 00001010 |
| C. | 11111111 |
| D. | 01101101 |
| Answer» D. 01101101 | |
| 4. |
Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K1? |
| A. | 00101111 |
| B. | 01011011 |
| C. | 01101000 |
| D. | 10100111 |
| Answer» B. 01011011 | |
| 5. |
In SDES, Encryption algorithm can be written as a composition of functions:IP-1 o fK2 o fK1 o SW o IP |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K2? |
| A. | 10100111 |
| B. | 01000011 |
| C. | 00100100 |
| D. | 01011010 |
| Answer» C. 00100100 | |
| 7. |
THE_PLAINTEXT_FOR_THE_CIPHERTEXT_00001111,_GIVEN_THAT_THE_KEY_IS_1111111111_IS?$ |
| A. | 01100111 |
| B. | 00001010 |
| C. | 11111111 |
| D. | 01101101 |
| Answer» D. 01101101 | |
| 8. |
Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?$ |
| A. | 11101010 |
| B. | 11011011 |
| C. | 01101000 |
| D. | 10101111 |
| Answer» B. 11011011 | |
| 9. |
The Plaintext for the Ciphertext 11110000, given that the key is 0000000000 is$ |
| A. | 01100111 |
| B. | 00000000 |
| C. | 01001000 |
| D. | 01101100 |
| Answer» C. 01001000 | |
| 10. |
In SDES, Encryption algorithm can be written as a composition of functions: |
| A. | |
| B. | True |
| Answer» C. | |
| 11. |
The Plaintext for the Ciphertext 00100010, given that the key is 1111111111 is |
| A. | 01100111 |
| B. | 00001010 |
| C. | 01001000 |
| D. | 01001100 |
| Answer» E. | |
| 12. |
The Ciphertext for the Plaintext 11010101, given that the key is 0111010001 is |
| A. | 00010001 |
| B. | 10110010 |
| C. | 11010010 |
| D. | 01110011 |
| Answer» E. | |
| 13. |
The Ciphertext for the Plaintext 01110010, given that the keys K1 is 10100100 and K2 is 01000011 is |
| A. | 01110111 |
| B. | 10010110 |
| C. | 01010110 |
| D. | 01000101 |
| Answer» B. 10010110 | |
| 14. |
Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1? |
| A. | 10100100 |
| B. | 01011011 |
| C. | 01101000 |
| D. | 10100111 |
| Answer» B. 01011011 | |
| 15. |
What is the size of the key in the SDES algorithm? |
| A. | 24 bits |
| B. | 16 bits |
| C. | 20 bits |
| D. | 10 bits |
| Answer» E. | |