MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which should be used first to decrypt? |
| A. | Public key |
| B. | Private key |
| C. | Public & Private key |
| D. | None of the mentioned |
| Answer» C. Public & Private key | |
| 2. |
Which algorithm is used for public key encryption? |
| A. | RSA |
| B. | Diffie-Hellman |
| C. | RSA & Diffie-Hellman |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
WHAT_IS_THE_KEY_SIZE_ALLOWED_IN_PGP??$ |
| A. | 1024-1056 |
| B. | 1024-4056 |
| C. | 1024-4096 |
| D. | 1024-2048 |
| Answer» D. 1024-2048 | |
| 4. |
Which should be used first to decrypt?$ |
| A. | Public key |
| B. | Private key |
| C. | Public & Private key |
| D. | None of the mentioned |
| Answer» C. Public & Private key | |
| 5. |
Which algorithm is used for public key encryption?$ |
| A. | RSA |
| B. | Diffie-Hellman |
| C. | RSA & Diffie-Hellman |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 6. |
DSA protocol is based on |
| A. | Discrete logarithm problem |
| B. | Continuous logarithm problem |
| C. | Discrete & Continuous logarithm problem |
| D. | None of the mentioned |
| Answer» B. Continuous logarithm problem | |
| 7. |
The hash function |
| A. | Is collision free |
| B. | Has manageable collision |
| C. | Has high unmanageable level of collision |
| D. | None of the mentioned |
| Answer» B. Has manageable collision | |
| 8. |
In hash function output length is fixed. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The digital signature provides authentication to the |
| A. | Sender |
| B. | Message |
| C. | Sender & Message |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 10. |
Which operation is used in encryption using IDEA? |
| A. | Addition modulo 216 |
| B. | Bit wise XOR |
| C. | Addition modulo 216 & Bit wise XOR |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 11. |
The key size of DES is |
| A. | 56 bits |
| B. | 64 bits |
| C. | 128 bits |
| D. | 168 bits |
| Answer» B. 64 bits | |
| 12. |
These three ciphers can operate of ______ of plaintext and cipher text. |
| A. | 128 bit blocks |
| B. | 64 bit blocks |
| C. | 256 bit blocks |
| D. | 156 bit blocks |
| Answer» C. 256 bit blocks | |
| 13. |
Which block cipher has key length of 128 bits? |
| A. | IDEA |
| B. | CAST |
| C. | IDEA & CAST |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 14. |
PGP offers _____ block ciphers for message encryption. |
| A. | Triple-DES |
| B. | CAST |
| C. | IDEA |
| D. | All of the mentioned |
| Answer» E. | |
| 15. |
Data compression includes |
| A. | Removal of redundant character |
| B. | Uniform distribution of characters |
| C. | Removal of redundant character & Uniform distribution of characters |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 16. |
For digital signatures private key cryptosystem is used. |
| A. | True |
| B. | False |
| Answer» C. | |
| 17. |
Public key cryptosystem is used for the encryption of |
| A. | Messages |
| B. | Session key |
| C. | Session key & Messages |
| D. | None of the mentioned |
| Answer» C. Session key & Messages | |
| 18. |
Pretty good privacy (PGP) security system uses |
| A. | Public key cryptosystem |
| B. | Private key cryptosystem |
| C. | Public & Private key cryptosystem |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |