MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Symmetric Ciphers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not a valid design parameter to be considered in designing stream ciphers? |
| A. | Keystream should be truly as random as possible |
| B. | Encryption sequence should have a large value |
| C. | Output of the PRNG (the key) should be sufficiently large |
| D. | All of the mentioned are valid points that should be considered while designing stream cipher blocks |
| Answer» E. | |
| 2. |
With reference to stream ciphers, the output of the generator is called |
| A. | Byte Stream |
| B. | Re-Seed Interval |
| C. | Key Length |
| D. | Keystream |
| Answer» E. | |
| 3. |
The Generate function precedes the Update phase in CTR_DRBG. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
What is the Seed length (seedlen) length for 3DES? |
| A. | 284 |
| B. | 260 |
| C. | 232 |
| D. | 216 |
| Answer» D. 216 | |
| 5. |
What is the Seed length (seedlen) length for AES-192 ? |
| A. | 428 |
| B. | 384 |
| C. | 320 |
| D. | 512 |
| Answer» D. 512 | |
| 6. |
The CTR mode uses a Key K and an Initial Vector V. The Intel Digital Random Number generator has these values initially as |
| A. | K = 0 ; V = 1 |
| B. | K = 0 ; V = 0 |
| C. | K = 1 ; V = 1 |
| D. | K = 1 ; V = 0 |
| Answer» C. K = 1 ; V = 1 | |
| 7. |
For the NIST CTR_DRBG , Seed length = |
| A. | Output Block Length |
| B. | Reseed Interval |
| C. | Reseed Interval + Output Block Length |
| D. | Output Block Length + Key Length |
| Answer» E. | |
| 8. |
Which of the following PRNGs is used in most recent Intel Chips? |
| A. | ANSI X9.17 PRNG |
| B. | NIST CTR_DRBG |
| C. | ANSI standard X9.82 |
| D. | None of the mentioned |
| Answer» C. ANSI standard X9.82 | |
| 9. |
How many DES encryptions take place in the ANSI X9.17 PRNG? |
| A. | 3 |
| B. | 6 |
| C. | 9 |
| D. | 12 |
| Answer» E. | |
| 10. |
How many 3DES blocks are present in the ANSI X9.17 PRNG? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 11. |
ANSI X9.17 uses a seed of size |
| A. | 56 bits |
| B. | 64 bits |
| C. | 32 bits |
| D. | 128 bits |
| Answer» C. 32 bits | |
| 12. |
Which mode is less prone to decryption : PRNG using CTR / PRNG using OFB? |
| A. | OFB |
| B. | CTR |
| C. | Both are equally prone |
| D. | Both can t be decrypted |
| Answer» C. Both are equally prone | |