MCQOPTIONS
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MCQOPTIONS
This section includes 46 Mcqs, each offering curated multiple-choice questions to sharpen your Operating System knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In _____________________ same keys are implemented for encrypting as well as decrypting the information. |
| A. | Symmetric Key Encryption |
| B. | Asymmetric Key Encryption |
| C. | Asymmetric Key Decryption |
| D. | Hash-based Key Encryption |
| Answer» B. Asymmetric Key Encryption | |
| 2. |
DES stands for ________________ |
| A. | Data Encryption Security |
| B. | Data Encrypted Standard |
| C. | Device Encryption Standard |
| D. | Data Encryption Standard |
| Answer» E. | |
| 3. |
A set of all probable decryption keys are collectively termed as key space. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 4. |
_______________ takes the plain text and the key as input for creating cipher-text. |
| A. | Decryption Algorithm |
| B. | Hashing Algorithm |
| C. | Tuning Algorithm |
| D. | Encryption Algorithm |
| Answer» B. Hashing Algorithm | |
| 5. |
The ________________ has piece of the keyword that has the same length as that of the plaintext. |
| A. | Block Cipher |
| B. | One-time pad |
| C. | Hash functions |
| D. | Vigenere Cipher |
| Answer» C. Hash functions | |
| 6. |
The procedure to add bits to the last block is termed as _________________ |
| A. | decryption |
| B. | hashing |
| C. | tuning |
| D. | padding |
| Answer» E. | |
| 7. |
__________ cryptography has always been focussing on the concept of ‘security through obscurity’. |
| A. | Modern |
| B. | Asymmetric |
| C. | Classic |
| D. | Latest |
| Answer» D. Latest | |
| 8. |
A set of all probable decryption keys are collectively termed as ____________ |
| A. | key-stack |
| B. | key bunch |
| C. | key space |
| D. | key pack |
| Answer» D. key pack | |
| 9. |
A cryptosystem is also termed as ______________ |
| A. | secure system |
| B. | cipher system |
| C. | cipher-text |
| D. | secure algorithm |
| Answer» C. cipher-text | |
| 10. |
The process of disguising plaintext in such a way that its substance gets hidden (into what is known as cipher-text) is called _________________ |
| A. | cryptanalysis |
| B. | decryption |
| C. | reverse engineering |
| D. | encryption |
| Answer» E. | |
| 11. |
_____________ is the concept that tells us about the replacement of every alphabet by another alphabet and the entire series gets ‘shifted’ by some fixed quantity. |
| A. | Rolling Cipher |
| B. | Shift Cipher |
| C. | Playfair Cipher |
| D. | Block Cipher |
| Answer» C. Playfair Cipher | |
| 12. |
Data Encryption Standard is implemented using the Feistel Cipher which employs 16 round of Feistel structure. |
| A. | DES |
| B. | IDEA |
| C. | Caesar cipher |
| D. | Twofish |
| Answer» B. IDEA | |
| 13. |
______________ employs a text string as a key that is implemented to do a series of shifts on the plain-text. |
| A. | Vigenere Cipher |
| B. | Shift Cipher |
| C. | Playfair Cipher |
| D. | Block Cipher |
| Answer» B. Shift Cipher | |
| 14. |
In __________________ 2 different keys are implemented for encrypting as well as decrypting that particular information. |
| A. | Symmetric Key Encryption |
| B. | Asymmetric Key Encryption |
| C. | Asymmetric Key Decryption |
| D. | Hash-based Key Encryption |
| Answer» C. Asymmetric Key Decryption | |
| 15. |
In Playfair cipher, at first, a key table is produced. That key table is a 5 by 5 grid of alphabets which operates as the key to encrypt the plaintext. |
| A. | Rolling Cipher |
| B. | Shift Cipher |
| C. | Playfair Cipher |
| D. | Block Cipher |
| Answer» D. Block Cipher | |
| 16. |
Which of the following is not a steganography tool? |
| A. | Xaio steganography |
| B. | Image steganography |
| C. | ReaperExploit |
| D. | Steghide |
| Answer» D. Steghide | |
| 17. |
People will normally think it as a normal/regular file and your secret message will pass on without any _______________ |
| A. | suspicion |
| B. | decryption |
| C. | encryption |
| D. | cracking |
| Answer» B. decryption | |
| 18. |
AES is at least 6-times faster than 3-DES. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 19. |
____________ carries out all its calculations on bytes rather than using bits and is at least 6-times faster than 3-DES. |
| A. | AES |
| B. | DES |
| C. | IDEA |
| D. | Twofish |
| Answer» B. DES | |
| 20. |
Which of the following is not an example of a block cipher? |
| A. | DES |
| B. | IDEA |
| C. | Caesar cipher |
| D. | Twofish |
| Answer» D. Twofish | |
| 21. |
____________ is a mono-alphabetic encryption code wherein each & every letter of plain-text is replaced by another letter in creating the cipher-text. |
| A. | Polyalphabetic Cipher |
| B. | Caesar Cipher |
| C. | Playfair Cipher |
| D. | Monoalphabetic Cipher |
| Answer» C. Playfair Cipher | |
| 22. |
Which of the following is not a steganography tool ? |
| A. | Crypture |
| B. | SteganographX Plus |
| C. | rSteg |
| D. | Burp Suite |
| Answer» E. | |
| 23. |
The method of reverting the encrypted text which is known as cipher text to its original form i.e. plain text is known as ________________ |
| A. | cryptanalysis |
| B. | decryption |
| C. | reverse engineering |
| D. | encryption |
| Answer» C. reverse engineering | |
| 24. |
By using ______________ you can diminish the chance of data leakage. |
| A. | Cryptography |
| B. | Tomography |
| C. | Chorography |
| D. | Steganography |
| Answer» E. | |
| 25. |
The word ________________is a combination of the Greek words ‘steganos’ which means “covered or concealed”, and ‘graphein’ which means “writing”. |
| A. | Cryptography |
| B. | Tomography |
| C. | Steganography |
| D. | Chorography |
| Answer» D. Chorography | |
| 26. |
Encryption-decryption in cryptosystem is done in ______ ways. |
| A. | 4 |
| B. | 3 |
| C. | 5 |
| D. | 2 |
| Answer» E. | |
| 27. |
_____________________ is the art & science of cracking the cipher-text without knowing the key. |
| A. | Cracking |
| B. | Cryptanalysis |
| C. | Cryptography |
| D. | Crypto-hacking |
| Answer» C. Cryptography | |
| 28. |
______________ is the mathematical procedure or algorithm which produces a cipher-text for any specified plaintext. |
| A. | Encryption Algorithm |
| B. | Decryption Algorithm |
| C. | Hashing Algorithm |
| D. | Tuning Algorithm |
| Answer» B. Decryption Algorithm | |
| 29. |
Cryptography offers a set of required security services. Which of the following is not among that 4 required security services? |
| A. | Encryption |
| B. | Message Authentication codes |
| C. | Hash functions |
| D. | Steganography |
| Answer» E. | |
| 30. |
Which of the following is not the primary objective of cryptography? |
| A. | Confidentiality |
| B. | Data Integrity |
| C. | Data Redundancy |
| D. | Authentication |
| Answer» D. Authentication | |
| 31. |
The main motive for using steganography is that hackers or other users can hide a secret message behind a ______________ |
| A. | special file |
| B. | ordinary file |
| C. | program file |
| D. | encrypted file |
| Answer» C. program file | |
| 32. |
A ________________ tool permits security professional or a hacker to embed hidden data within a carrier file like an image or video which can later be extracted from them. |
| A. | Cryptography |
| B. | Tomography |
| C. | Chorography |
| D. | Steganography |
| Answer» E. | |
| 33. |
In _______________ the plain-text is processed 1-bit at a time & a series of actions is carried out on it for generating one bit of cipher-text. |
| A. | Block Cipher |
| B. | One-time pad |
| C. | Stream cipher |
| D. | Vigenere Cipher |
| Answer» D. Vigenere Cipher | |
| 34. |
In _____________ a sequence of actions is carried out on this block after a block of plain-text bits is chosen for generating a block of cipher-text bits. |
| A. | Block Cipher |
| B. | One-time pad |
| C. | Hash functions |
| D. | Vigenere Cipher |
| Answer» B. One-time pad | |
| 35. |
____________________ is a mathematical algorithm that produces a unique plain text for a given cipher text along with a decryption key. |
| A. | Decryption Algorithm |
| B. | Hashing Algorithm |
| C. | Tuning Algorithm |
| D. | Encryption Algorithm |
| Answer» B. Hashing Algorithm | |
| 36. |
Steganography follows the concept of security through obscurity. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 37. |
_____________ is hiding of data within data, where we can hide images, text, and other messages within images, videos, music or recording files. |
| A. | Cryptography |
| B. | Tomography |
| C. | Steganography |
| D. | Chorography |
| Answer» D. Chorography | |
| 38. |
_____________ is another data hiding technique which can be used in conjunction with cryptography for the extra-secure method of protecting data. |
| A. | Cryptography |
| B. | Steganography |
| C. | Tomography |
| D. | Chorography |
| Answer» C. Tomography | |
| 39. |
_______________ cryptography deals with traditional characters, i.e., letters & digits directly. |
| A. | Modern |
| B. | Classic |
| C. | Asymmetric |
| D. | Latest |
| Answer» C. Asymmetric | |
| 40. |
AES stands for ________________ |
| A. | Advanced Encryption Security |
| B. | Advanced Encryption Standard |
| C. | Advanced Encrypted Standard |
| D. | Active Encryption Standard |
| Answer» C. Advanced Encrypted Standard | |
| 41. |
________________ is a cipher formed out of substitution where for a given key-value the cipher alphabet for every plain text remains fixed all through the encryption procedure. |
| A. | Polyalphabetic Cipher |
| B. | Caesar Cipher |
| C. | Playfair Cipher |
| D. | Monoalphabetic Cipher |
| Answer» E. | |
| 42. |
Data Encryption Standard is an example of a _____________ cryptosystem. |
| A. | conventional |
| B. | public key |
| C. | hash key |
| D. | asymmetric-key |
| Answer» B. public key | |
| 43. |
Conventional cryptography is also known as _____________ or symmetric-key encryption. |
| A. | secret-key |
| B. | public key |
| C. | protected key |
| D. | primary key |
| Answer» B. public key | |
| 44. |
There are ________ types of cryptographic techniques used in general. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 45. |
WHAT_IS_ROLE_OF_KEY_DISTRIBUTION_CENTER_??$ |
| A. | It is used to distribute keys to everyone in world |
| B. | It intended to reduce the risks inherent in exchanging keys |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| 46. |
What is not a role of encryption ? |
| A. | It is used to protect data from unauthorized access during transmission |
| B. | It is used to ensure user authentication |
| C. | It is used to ensure data integrity |
| D. | It is used to ensure data corruption doesn’t happens |
| Answer» E. | |