Explain how three different cryptographic techniques can be used to build a digital envelope and digital signature thus achieving secure communications. Illustrate your answer with a figure and explain how

a. In the context of cryptography, please explain the concepts of confusion, diffusion and the avalanche
effect. (6 Marks)
b. Explain how three different cryptographic techniques can be used to build a digital envelope and digital
signature thus achieving secure communications. Illustrate your answer with a figure and explain how
data integrity, confidentiality/privacy, authentication and non-repudiation are achieved. (7 Marks)
c. In the context of S/MIME:
i. Define the following terms: Enveloped data; signed data; clear signed data; signed and
enveloped data. (4 Marks)

 

 

 

 

 

 

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