Network security Quiz 3

1.Signature matching techniques are not capable to detect metamorphic malwares.

Select one:
True{correct}
False

2.ESP provides both message content confidentiality and authentication.

Select one:
True {correct}
False

3.DSA security level is 120 bit.

Select one:
True
False{correct}

4.Signature matching technique can be used to detect metamorphic malware.

Select one:
True
False{correct}

5.Digital signature only provide non-repudiation.

Select one:
True
False {correct}

6.In key agreement two or more parties jointly generate a secret key.

Select one:
True {correct}
False

7.In PGP signature is generated after encryption.

Select one:
True
False{correct}

8.In PGP signature is generated before encryption.

Select one:
True {correct}
False

9.SSL/TLS works below the TCP layer

Select one:
True
False{correct}

10.Kerberos is not scalable.

Select one:
True
False{correct}

11.SSL provides security at IP layer.

Select one:
True
False {correct} //at application layer

12.Default BLOCK/DROP action is good to set in firewall.

Select one:
True
False {correct}

13.RSA signature verification is less efficient then DSA.

Select one:
True
False{correct}

14.SSL is originally designed by google.

Select one:
True
False{correct} // by netscape

15.Without certificate Diffe-Hellman key exchange is vulnerable to MIM attack.
Select one:
True {correct}
False

16.Digital signature only provide Authentication.

Select one:
True
False{correct}

17.S/MIME provides security at application layer.

Select one:
True{correct}
False

18.In key agreement one party generates and distributes a secret key.

Select one:
True
False{correct}

19.In key transport two or more parties jointly generate a secret key.

Select one:
True
False{correct}

20.AH provides message content confidentiality.

Select one:
True
False{correct}

21.Default ACCEPT action is good to set in firewall.
Select one:
True
False{correct}

22.RSA signature verification is more efficient then DSA.

Select one:
True{correct}
False

23.Firewalls insulates the internal network from external network.

Select one:
True{correct}
False

24.Modulus of the DHKE can be a composite number.

Select one:
True
False{correct}

25.In key transport one party generates and distributes a secret key.

Select one:
True{correct}
False

Network Security Quiz 2

1.DES is based on Fiestel cipher.

Select one:
True {correct}
False

2.Symmetric key does not provide nonrepudiation.

Select one:
True {correct}
False

3.AES is a 128/192/256 key bits cipher.

Select one:
True {correct}
False

4.Key whitening makes the block ciphers such as DES much more resistant against brute-force attacks.

Select one:
True {correct}
False

5.Output Feedback  mode a block cipher can be used to build a stream cipher encryption scheme.

Select one:
True{correct}
False

6.Symmetric key provide non-repudiation.

Select one:
True
False {correct}

7.DES is based on on single S-box. 

Select one:
True
False{correct}

8.Security level of 3DES  is 168 bits.

Select one:
True
False{correct}

9.RSA 1024 bit has 80 bit security level.

Select one:
True{correct}
False

10.Fermat'l Little theroem can be use for finding the inverse of an integer.

Select one:
True{correct}
False

11.In  Cipher Block Chaining mode any ciphertext block depends on all previous plaintext blocks.

Select one:
True{correct}
False

12.Cipher Block Chaining mode any ciphertext block does not depends on previous plaintext blocks.

Select one:
True
False{correct}

13.Digital signature only provide Authentication.
/*
A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, such that the sender cannot deny having sent the message (authentication and non-repudiation) and that the message was not altered in transit (integrity).
*/
Select one:
True
False{correct}

14.AES is a modern block cipher which supports only 128 bit key length.

Select one:
True
False{correct}

15.In DES avalanche effects comes after 8th round.

Select one:
True
False{correct}

16.Security level of DES  is 64 bits.

Select one:
True
False{correct}

17.Electronic Code Book  mode is susceptible to substitution attacks.

Select one:
True{correct}
False

18.In DES avalanche effects comes after 5th round.

Select one:
True{correct}
False

19.Each DES S-box has six input bits and four output bits.

Select one:
True{correct}
False

20.In Electronic Code Book mode operations synchronization between the encryption and decryption parties is not necessary.

Select one:
True{correct}
False

21.Fermat'l Little theroem can't find the inverse of an integer.

Select one:
True
False{correct}

22.Security level of DES  is 56 bits.

Select one:
True{correct}
False

23.AES is based on Feistel cipher.

Select one:
True
False{correct}


24.Each DES S-box has four input bits and four output bits.

Select one:
True
False{correct}

25.In AES each layer manipulates all 128 bits of the data path.

Select one:
True{correct}
False

Network Security Quiz 1

1.Steganography hides secret message in other message.
Select one:
True {correct}
False

2.Each DES S-box has six input bits and four output bits.
Select one:
True  {correct}                      
False

3.According kerchoff's principle, a cryptosystem should be secure even if the attacker knows all details about the system, with the exception of the secret key.
Select one:
True {correct}
False

4.RC4 encrypts data byte by byte.
Select one:
True {correct}
False

5.In substitution cipher order of the letter does not change.
Select one:
True {correct}
False

6.According kerchoff's principle, the attacker should not know the encryption and decryption algorithms.
Select one:
True
False {correct}

7.A mono-alphabetic substitution cipher replaces one character with another character.
Select one:
True{correct}
False

8.In transposition cipher order of the letter does not change.
Select one:
True
False {correct}

9.DES is a cipher encrypts blocks of length of 64 bits with a key of size of 56 bits.
Select one:
True {correct}
False

10.Substitution cipher rearrange the order of the letters in a message.
Select one:
True
False {correct}

11.A cryptosystem is computationally secure if the best known algorithm for breaking it requires at least 't' operations.
Select one:
True{correct}
False

12.In a symmetric key cipher, the same key is used by both the sender and receiver.
Select one:
True{correct}
False

13.A cryptosystem is unconditionally secure if it cannot be broken even with infinite computational resources.
Select one:
True {correct}
False

14.Cryptography provides security through obscurity.
Select one:
True
False {correct}

15.In a symmetric key cipher, different key are used by both the sender and receiver.
Select one:
True
False {correct}

16.RC4 encrypts data bit by bit.
Select one:
True
False {correct}

17.Steganography provides security through obscurity.
Select one:
True{correct}
False

18.Range of possible values used to construct keys is called key space.
Select one:
True {correct}
False

19.The ciphertext is the message after transformation.
Select one:
True {correct}
False

20.There are 5 equivalence class for the modulus 5.
Select one:
True {correct}
False

21.Each DES S-box has four input bits and four output bits.
Select one:
True
False {correct}

22.Cryptanalysis is used to find some insecurity in a cryptographic scheme.
Select one:
True {correct}
False

23.DES is a cipher  encrypts blocks of length of 64 bits with a key of size of 48 bits.
Select one:
True
False {correct}


24.Transposition cipher rearrange the order of the letters in a message.
Select one:
True{correct}
False

25.There are 8 equivalence class for the modulus 7.
Select one:
True
False {correct}