GATE | Sudo GATE 2020 Mock II (10 January 2019) | Question 13

S1- MD5 is vulnerable to the Birthday attack.
S2- traceroute uses the "Destination port unreachable" ICMP error message.
S3- 3DES is a type of Public Key Encrytion Algorithm.
S4- IPv6 has a 40-byte fixed header size(without Options fields). 

How many of the above statements are true ?
(A) 1
(B) 2
(C) 3
(D) 4


Answer: (C)

Explanation: S1– MD5 is a cryptographic Hash function and is vulnerable to birthday attack. True
S2– traceroute uses the “Destination port unreachable” ICMP error message. True
traceroute sends an arbitrary port in the ICMP message, which the host is unable to resolve and hence it returns an ICMP error message. Traceroute ends after receiving this message since only the receiver checks the port number.
S3– 3DES is a type of Public Key Encrytion Algorithm. False
3DES is a type of private key encryption algorithm.
S4– IPv6 has a 40-byte fixed header size(without Options fields). True
Without any options field, the IPv6 packet has a fixed size of 40 bytes.
Number of correct statements = 3, which is answer.


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