Give brief and clear explanations for the following by showing in a step-by-step

Question

Give brief and clear explanations for the following by showing in a step-by-step manner how the BG would attack the scheme if we changed things as suggested in the question Consider the key distribution protocol of Figure 11.18. page 447 for distributing session keys using secret-key encryption and the Key Distribution Center. K_a is the master key shared between A and the KDC, is the master key shared between B ami the KDC, K. is the session key to be used to encrypt data between A and B, and N_a, N_b is nonce. Explain what role N_b plays in the protocol i.e. assuming that N_b, was not there in the protocol, how would the bad guy BG attack the scheme? Explain why in round (3) ID_A is included in the encrypted i.e., suppose that round (3) consisted of ID_a, E_k, (K_s, N_b) (so that ID_a was being sent in the clear) how would the bad guy BG attack the scheme? Explain why in round (3) (K_s, ID_a, N_b) is encrypted with Ek_b i.e. i.e. supposes that round (3) consisted of (K_s, ID_a, N_b) instead of (K_s, ID_a, N_b), how would the bad guy BG attack the scheme?

Explanation / Answer

Its feel great to always talk about the Secret-key encryption techniques, Let me elaborate you in more sequence manner by fulfilling the desired requirement:-

a) The main role of Nb is that is counts the No. of words in any Advanced Encryption Standard(AES) Technique.
It is assumed to play a vital role in encrypting the words and storing it in a secure manner. The usage of Nb will allows us to eradicate us from the duplication and normalization.

b) The protocol Ekb (Ks, 1DA , Nb), It forwards a session key to Ks which propose to be exceptional for conversation with Nb" . It means it has given the acess to EKb by the Attacker.

Next, The protocol doesn't obtains any key-value pair encrytion. For making it Validated, The 1DA must obey EKb  to accept the key information sign.

Let me dexribe you more in equation way:- Suppose

c) The round (Ks,1DA, Nb ) is encrypted because it mainly uses the authenticated encryption technique which elaborates on a secure message parser alogorithms which makes it End-to-End operation that won't obligue from third party protocols.

I have designed and developed the Algorithm technique for it. Have a look into it.

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