McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
In symmetric-key cryptography, the key locks and unlocks the box is |
| A. | same |
| B. | shared |
| C. | private |
| D. | public |
| Answer» A. same | |
| 2. |
The keys used in cryptography are |
| A. | secret key |
| B. | private key |
| C. | public key |
| D. | all of them |
| Answer» D. all of them | |
| 3. |
Cryptography, a word with Greek origins, means |
| A. | corrupting data |
| B. | secret writing |
| C. | open writing |
| D. | closed writing |
| Answer» B. secret writing | |
| 4. |
A transposition cipher reorders (permutes) symbols in a |
| A. | block of packets |
| B. | block of slots |
| C. | block of signals |
| D. | block of symbols |
| Answer» D. block of symbols | |
| 5. |
Network Security provides authentication and access control for resources. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 6. |
Which is not an objective of network security? |
| A. | identification |
| B. | authentication |
| C. | access control |
| D. | lock |
| Answer» D. lock | |
| 7. |
The process of verifying the identity of a user. |
| A. | authentication |
| B. | identification |
| C. | validation |
| D. | verification |
| Answer» A. authentication | |
| 8. |
Which of these is a part of network identification? |
| A. | user id |
| B. | password |
| C. | otp |
| D. | fingerprint |
| Answer» A. user id | |
| 9. |
The process of transforming plain text into unreadable text. |
| A. | decryption |
| B. | encryption |
| C. | network security |
| D. | information hiding |
| Answer» B. encryption | |
| 10. |
An algorithm used in encryption is referred to as cipher. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 11. |
A process of making the encrypted text readable again. |
| A. | decryption |
| B. | encryption |
| C. | network security |
| D. | information hiding |
| Answer» A. decryption | |
| 12. |
A person who enjoys learning details about computers and how to enhance their capabilities. |
| A. | cracker |
| B. | hacker |
| C. | app controller |
| D. | site controller |
| Answer» B. hacker | |
| 13. |
A small program that changes the way a computer operates. |
| A. | worm |
| B. | trojan |
| C. | bomb |
| D. | virus |
| Answer» D. virus | |
| 14. |
An asymmetric-key (or public-key) cipher uses |
| A. | 1 key |
| B. | 2 key |
| C. | 3 key |
| D. | 4 key |
| Answer» B. 2 key | |
| 15. |
We use cryptofraphy term to transform messages to make them secure and immune to |
| A. | change |
| B. | idle |
| C. | attacks |
| D. | defend |
| Answer» C. attacks | |
| 16. |
In cryptography , the original message before being transformmed , is called |
| A. | simple text |
| B. | plain text |
| C. | empty text |
| D. | filled text |
| Answer» B. plain text | |
| 17. |
A straight permutation cipher or a straight p-box has the same number of input as |
| A. | cipher |
| B. | frames |
| C. | outputs |
| D. | bits |
| Answer» C. outputs | |
| 18. |
The man-in-the-middle attack can endanger the security of the diffie-hellman if two parties are not |
| A. | authenticated |
| B. | joined |
| C. | submit |
| D. | separate |
| Answer» A. authenticated | |
| 19. |
Which of the following is not a transport layer vulnerability? |
| A. | mishandling of undefined , poorly defined |
| B. | the vulnerability that allows fingerprinting & other enumeration of host information |
| C. | overloading of transporting layer mechanisms |
| D. | unauthorized network access |
| Answer» D. unauthorized network access | |
| 20. |
Transmission mechanisms can be subject to spoofing & attacks based on skilled modified packets. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 21. |
TCP/IP model does not have layer but OSI model have this layer. |
| A. | session layer |
| B. | transport layer |
| C. | application layer |
| D. | network layer |
| Answer» A. session layer | |
| 22. |
In cryptography, what is cipher? |
| A. | algorithm for performing encrption and decryption |
| B. | encrypted message |
| C. | both algorith for performing encrption and decryption and encrypted message |
| D. | decrypted message |
| Answer» A. algorithm for performing encrption and decryption | |
| 23. |
In cryptography, the order of the letters in a message is rearranged by |
| A. | transpositional ciphers |
| B. | substitution ciphers |
| C. | both |
| D. | quadratic ciphers |
| Answer» A. transpositional ciphers | |
| 24. |
What is data encryption standard (DES)? |
| A. | block cipher |
| B. | stream cipher |
| C. | bit cipher |
| D. | byte cipher |
| Answer» A. block cipher | |
| 25. |
Cryptanalysis is used |
| A. | to find some insecurity in a cryptographic scheme |
| B. | to increase the speed |
| C. | to encrypt the data |
| D. | to make new ciphers |
| Answer» A. to find some insecurity in a cryptographic scheme | |
| 26. |
Choose from among the following cipher systems, from best to the worst, with respect to ease of decryption using frequency analysis. |
| A. | random polyalphabetic , plaintext , playfair |
| B. | random polyalphabetic , playfair , vignere |
| C. | random polyalphabetic , vignere , playfair , plaintext |
| D. | random polyalphabetic , plaintext , beaufort , playfair |
| Answer» C. random polyalphabetic , vignere , playfair , plaintext | |
| 27. |
On Encrypting “thepepsiisintherefrigerator” using Vignere Cipher System using the keyword “HUMOR” we get cipher text- |
| A. | abqdnwewuwjphfvrrtrfzn sdokvl |
| B. | abqdvmwuwjphfvvyyrf znydokvl |
| C. | tbqyrvmwuwjphfvvyy rfznydokvl |
| D. | baiuvmwuwjphfoeiyrf znydokvl |
| Answer» B. abqdvmwuwjphfvvyyrf znydokvl | |
| 28. |
. Rail Fence Technique is an example of |
| A. | substitution |
| B. | transposition |
| C. | product cipher |
| D. | ceaser cipher |
| Answer» B. transposition | |
| 29. |
Public key encryption is advantageous over Symmetric key Cryptography because of |
| A. | speed |
| B. | space |
| C. | key exchange |
| D. | key length |
| Answer» C. key exchange | |
| 30. |
The sub key length at each round of DES is |
| A. | 32 |
| B. | 56 |
| C. | 48 |
| D. | 64 |
| Answer» B. 56 | |
| 31. |
Which one is the strong attack mechanism? |
| A. | chosen plaintext attack |
| B. | chosen cipher text |
| C. | brute force attack |
| D. | man in the middle attack |
| Answer» C. brute force attack | |
| 32. |
Interception is an attack on |
| A. | availability |
| B. | confidentiality |
| C. | integrity |
| D. | authenticity |
| Answer» B. confidentiality | |
| 33. |
Chosen cipher text attack is based on |
| A. | cryptanalysis |
| B. | cryptography |
| C. | encryption |
| D. | decryption |
| Answer» A. cryptanalysis | |
| 34. |
The process of writing the text as rows and read it as columns is known as |
| A. | vernam cipher |
| B. | ceaser cipher |
| C. | transposition columnar cipher |
| D. | homophonic substitution cipher |
| Answer» C. transposition columnar cipher | |
| 35. |
Biometric authentication works on the basis of |
| A. | human characteristics |
| B. | passwords |
| C. | smart cards |
| D. | pin |
| Answer» A. human characteristics | |
| 36. |
Which layer filters the proxy firewall? |
| A. | application |
| B. | network |
| C. | transport |
| D. | none of the above |
| Answer» A. application | |
| 37. |
Encryption Strength is based on |
| A. | strength of algorithm |
| B. | secrecy of key |
| C. | length of key |
| D. | all of the above |
| Answer» D. all of the above | |
| 38. |
GCD(a,b) = GCD(b,a mod b) |
| A. | true |
| B. | false |
| C. | cannot be determined |
| D. | none |
| Answer» A. true | |
| 39. |
All groups satisfy properties |
| A. | g-i to g-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | r-i to r-v |
| Answer» C. g-i to r-v | |
| 40. |
An Abelian Group satisfies the properties |
| A. | g-i to g-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | r-i to r-v |
| Answer» A. g-i to g-v | |
| 41. |
A Ring satisfies the properties |
| A. | r-i to r-v |
| B. | g-i to g-iv |
| C. | g-i to r-v |
| D. | g-i to r-iii |
| Answer» D. g-i to r-iii | |
| 42. |
A Ring is said to be commutative if it also satisfies the property |
| A. | r-vi |
| B. | r-v |
| C. | r-vii |
| D. | r-iv |
| Answer» D. r-iv | |
| 43. |
An ‘Integral Domain’ satisfies the properties |
| A. | g-i to g-iii |
| B. | g-i to r-v |
| C. | g-i to r-vi |
| D. | g-i to r-iii |
| Answer» C. g-i to r-vi | |
| 44. |
Does the set of residue classes (mod 3) form a group with respect to modular addition? |
| A. | yes |
| B. | no |
| C. | can\t say |
| D. | insufficient data |
| Answer» A. yes | |
| 45. |
For the group Sn of all permutations of n distinct symbols, what is the number of elements in Sn? |
| A. | n |
| B. | n-1 |
| C. | 2n |
| D. | n! |
| Answer» D. n! | |
| 46. |
a(b+c) = ac+bc is the representation for which property? |
| A. | g-ii |
| B. | g-iii |
| C. | r-ii |
| D. | r-iii |
| Answer» D. r-iii | |
| 47. |
a.(b.c) = (a.b).c is the representation for which property? |
| A. | g-ii |
| B. | g-iii |
| C. | r-ii |
| D. | r-iii |
| Answer» A. g-ii | |
| 48. |
AES uses a bit block size and a key size of bits. |
| A. | 128; 128 or 256 |
| B. | 64; 128 or 192 |
| C. | 256; 128, 192, or 256 |
| D. | 128; 128, 192, or 256 |
| Answer» D. 128; 128, 192, or 256 | |
| 49. |
Like DES, AES also uses Feistel Structure. |
| A. | true |
| B. | false |
| C. | cannot be determined |
| D. | none |
| Answer» B. false | |
| 50. |
Which one of the following is not a cryptographic algorithm? |
| A. | jupiter |
| B. | blowfish |
| C. | serpent |
| D. | none |
| Answer» A. jupiter | |
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