The sender do the following operations on message m before sending it Protocol A c e k1 m h( k 2 x) where e is a private key encryption algorithm, m is the message sent, h() is a hashing function ( such as SHA 1), indicates a concatenation, and k1, k2 are secret keys which are stored only at sender and receiver Protocol B c e k1 m sigk pr (h m ) Explain in details which the processes that the receiver will do step by step upon receipt of c 8 Marks b) The sender do the following operations on message m before sending it 1 Protocol A C eki m h(k2 x) where me is a private key encryption algorithm, m is the message sent, h() is a hashing function ( such as SHA 1), Il indicates a concatenation, and k1, k2 are secret keys which are stored only at sender and receiver 2 Protocol B c eki m sigkpr (h(m)) Explain in details which the processes that the receiver will do step by step upon receipt of c 8 Marks)

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Question: The sender do the following operations on message m before sending it: Protocol A: c= e k1 [m h( k 2 x)] where e is

The sender do the following operations on message m before sending it:
1. Protocol A:

c=ek1[m h(k2x)]

where e is a private-key encryption algorithm, m is the message sent, h() is a hashing function ( such as SHA-1), || indicates a concatenation, and k1, k2 are secret keys which are stored only at sender and receiver.

Protocol B:

c=ek1[m sigkpr(hm)]

Explain in details which the processes that the receiver will do step-by-step upon receipt of c [8 Marks].

The sender do the following operations on message m before sending

b) The sender do the following operations on message m before sending it: 1. Protocol A: C = eki[m || h(k2 || x)] where me is a private-key encryption algorithm, m is the message sent, h() is a hashing function ( such as SHA-1), Il" indicates a concatenation, and k1, k2 are secret keys which are stored only at sender and receiver. 2. Protocol B: c = eki[m || sigkpr (h(m))] Explain in details which the processes that the receiver will do step-by-step upon receipt of c [8 Marks)

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