Forwards Secrecy Protocols - 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 

Which of the following statements is true, at the end of the protocol, and with regards to the purpose of the protocol:
a) Both A and B establish a session key K2, and B is sure of A’s identity
b) Both A and B establish a session key K1, and B is sure of A’s identity
c) Both A and B establish a session key K1, and A is sure of B’s identity
d) Both A and B establish a session key K1, and both B and A are sure of each other’s identity
e) Both A and B establish a session key K2, and A is sure of B’s identity
f) Both A and B establish a session key K1
g) Both A and B establish a session key K2
h) Both A and B authenticate each other by knowing each other’s identities
i) A ends up knowing B’s identity
j) B ends up knowing A’s identity
k) None of the above

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:
a) At time point 4, both A and B can produce evidence to prove that they received K
b) At time point 2, both A and B can produce evidence to prove that they received a signed message from the other party
c) At time point 0, S cannot prove anything
d) At time point 3, B cannot produce evidence to prove that A has access to key K
e) At time point 1, A can prove that B is alive
f) At time point 4, S can prove that A is alive
g) At time point 3, S can produce evidence that that A has access to key K
h) At time point 0, A is not alive
i) At time point 2, A can produce evidence to prove that B is alive
j) At time point 4, the protocol terminates

Question 4   Forwards Secrecy Protocols  

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
 

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