Consider the following statements with respect to IPv6 :
S1 : IPv6 packet has field for the header checksum.
S2 : It has an explicit extension header for fragmentation.
S3 : It has encrypted security payload (ESP) extension header that ensures the integrity of the data.
Which of the given statements is correct?
A Only S1 and S3
B Only S2 and S3
C Only S2
D None of these
Given answer is B
But does ESP provides integrity.? I know that integrity is provided by auth. extension header and confidentiality by ESP.But can ESP provides message integrity also?
ESP Ensure the Integrity of data, it uses mostly SHA-1 algo for message digest and put the ipsec header and tailor in the transport layer packet. This modified packet helps to maintain the message integrity which means prevention of modification of data, thus it does not allow any modification of data. because any modification can easily be caught at sender side.
i selected c only but they have given b
Also see comment by @Anu007 which suggests answer as b