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NPTEL Ethical Hacking Assignment 7 Answers (Week 7)
Q1. Two messages M1 and M2 are fed to a hash function HASH to generate the hash values:
H1 = HASH (M1)
H2= HASH (M2)
When do we say there is a collision?
a. H1 = H2.
b. M1 = M2.
c. H1 = HASH (H2).
d. None of these.
Answer: a. H1 = H2.
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Q2. What do you mean by first preimage resistance in the context of hash functions?
a. Except for few hash values H, it is difficult to find a message M such that HASH(M) = H.
b. Given a message M1, it is difficult to find another message M2 such that HASH(M1) = HASH(M2).
c. It is difficult to find two messages M1 and M2 such that HASH(M1) = HASH(M2).
d. None of these
Answer: a. Except for few hash values H, it is difficult to find a message M such that HASH(M) = H.
Q3. What kind of mapping does a hash function implement?
a. One-to-one mapping
b. Many-to-one mapping
c. One-to-many mapping
d. Many-to-many mapping
Answer: b. Many-to-one mapping
Q4. Which of the following is/are not hash functions?
a. MD5
b. Triple-DES
c. SHA-1
d. RSA
Answer: b. Triple-DES
d. RSA
Q5. Which of the following algorithms are the slowest and the fastest?
a. Hash function, Symmetric-key encryption
b. Public-key encryption, Symmetric-key encryption
c. Symmetric-key encryption, Hash function
d. None of these
Answer: d. None of these
Q6. What are the block size of DES algorithm and the hash digest size of MD5 algorithm?
a. 64 bits, 64 bits
b. 56 bits, 128 bits
c. 64 bits, 128 bits
d. 64 bits, 256 bits
Answer: c. 64 bits, 128 bits
Q7. On which cryptographic algorithm can the birthday attack be mounted?
a. Cryptographic hash function
b. Symmetric-key cryptography
c. Public-key cryptography
d. Diffie-Hellman key exchange
e. None of these
Answer: a. Cryptographic hash function
Q8. What kinds of algorithms are typically used in the computation of digital signature?
a. Cryptographic hash function
b. Symmetric-key encryption
c. Public-key encryption
d. All of these
Answer: c. Public-key encryption
Q9. The SSL record protocol is responsible for
a. Data encryption
b. Data authentication
c. Non repudiation
d. All of these
Answer: d. All of these
Q10. Which of the following security protocols work above the IP layer in the TCP/IP protocol stack?
a. IPSec
b. TLS
c. SSL
d. HTTPS
Answer: b. TLS
c. SSL
d. HTTPS
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