Quiz: Computer And Network Security Practice Questions!
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- 1.A process of making the encrypted text readable again.
- A.
Decryption
- B.
Encryption
- C.
Network Security
- D.
Information Hiding
- 2.A small program that changes the way a computer operates.
- A.
Worm
- B.
Trojan
- C.
Bomb
- D.
Virus
- 3.Ram chooses 7 and 11 as two prime numbers. He chooses 13 as the value of e. The ciphertext obtained using RSA algorithm is 26. What is the planintext?
- 4.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
- 5.Which one of the following is a cryptographic protocol used to secure HTTP connection?
- A.
Stream control transmission protocol (SCTP)
- B.
Transport layer security (TLS)
- C.
Explicit congestion notification (ECN)
- D.
Resource reservation protocol
- 6.If end to end connection is done at a network or IP level, and if there are 10 hosts, then what is the number of keys required?
- 7.. When a hash function is used to provide message authentication, the hash function value is called to as:
- 8.Using Rabin cryptosystem with p=23 and q=7 Encrypt P=24 to find ciphertext. The Cipher text is
- 9.In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.
- A.
48, 32
- B.
64,32
- C.
56, 24
- D.
32, 32
- 10.In tunnel mode, IPSec protects the ______
- A.
IP header
- B.
IP trailer
- C.
Entire IP packet
- D.
IP payload
- 11.Which component is included in IP security?
- A.
Authentication Header (AH)
- B.
Encapsulating Security Payload (ESP)
- C.
Internet key Exchange (IKE)
- D.
All of the mentioned
- 12.A hash function guarantees the integrity of a message. It guarantees that the message has not be
- A.
Replaced
- B.
Over view
- C.
Changed
- D.
Violated
- 13.The responsibility of certification authority for digital signature is to authenticate
- A.
Hash function used
- B.
Private key of the user
- C.
Public key of the user
- D.
Key used in AES
- 14.For a client-server authentication, the client requests from the KDC a ________ for access to a specific asset.
- 15.Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter.
- A.
Confidentiality
- B.
Integrity
- C.
Authentication
- D.
All
- 16.A digital certificate system
- A.
Uses third-party CAs to validate a user's identity.
- B.
Uses digital signatures to validate a user's identity.
- C.
Uses tokens to validate a user's identity.
- D.
Are used primarily by individuals for personal correspondence.
- 17.In case of public key cryptography, X adds a digital signature K to message M, encrypts < M, K >, and sends it to Y, where it is decrypted. Choose the correct sequences of keys is used for the operations?
- A.
Encryption: X’s private key followed by Y’s private key; Decryption: X’s public key followed by Y’s public key
- B.
Encryption: X’s private key followed by Y’s public key; Decryption: X’s public key followed by Y’s private key
- C.
Encryption: X’s public key followed by Y’s private key; Decryption: Y’s public key followed by X’s private key
- D.
Encryption: X’s private key followed by Y’s public key; Decryption: Y’s private key followed by X’s public key
- 18.How many keys are required for two people to communicate via a cipher?
- A.
Two key for symmetric ciphers, two keys for asymmetric ciphers
- B.
One key for symmetric ciphers and asymmetric ciphers
- C.
One key for symmetric ciphers, two keys for asymmetric ciphers
- D.
Two key for symmetric ciphers, one keys for asymmetric ciphers
- 19.What will be the plain text corresponding to ciphered text “rmw ” if an affine cipher is used with key values as a=5, b=10?
- A.
Csk
- B.
Kkr
- C.
Srt
- D.
Msd
- 20.X=3mod7, X=3mod13, X=0mod12. The value of X is__________
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