Cryptographic Data Objects - Authentication and Non - Repudiation and Anonymity Protocols - Engineering Assignment Help

Assignment Task :

Question 1
Cryptographic Data Objects
B has just received the following message, which represents a cryptographic data object:

Question 2 
Authentication Protocols
Consider the following 4-message protocol:

Question 3 
Non-Repudiation and Anonymity Protocols
For the Zhou-Gollman non-repudiation protocol discussed in the lecture on “Non-Repudiation and Anonymity Protocols”, which one of the following statements is false:

Question 4
Forwards Secrecy Protocols
Consider the following 4-message protocol:

Assume three runs of the above protocol, that we call P1, P2 and P3. If after completion of run P3, K1 is compromised, i.e. it is leaked to some external intruder, how would this impact the forward secrecy property of K2 for all the three runs of the protocol P1, P2 and P3? Choose the right answer:
a) Compromising K1 in P3 compromises every other key in all of the three runs of the protocol
b) The secrecy of P3.K2 is not compromised, and therefore P2.K2 and P1.K2 would remain secret
c) Compromising K1 in P3 compromises P3.K2, and therefore, every other previous version of K1 and K2 are also compromised
d) The secrecy of P3.K2 is compromised, but P2.K2 and P1.K2 would remain secret since K1 is refreshed after each run, therefore P3.K1 is different from P2.K1 and is different from P1.K1
e) Even though K1 is compromised in P3, K2 is not compromised in any of the three runs

Question 6 
Mutation and Type-Flaw Attacks
Consider the following 4-message protocol between A and B, where (N+1) represents the increment of N:

Question 7
Access Control Models and Policies
Assume a network that consists of a set of nodes, {a, b, c, d, e, f, g, h, j, k, l, x, z}. These nodes have the following partial order relation on them:

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