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a . Briefly explain the concept of digital signatures. [ 5 Marks ] b . Alice wants to establish a secure communication channel with Bob
a Briefly explain the concept of digital signatures.
Marks
b Alice wants to establish a secure communication channel with Bob by digitally
signing her messages. Design a robust digital signature system tailored to
their communication needs. Provide detailed insights into the key
components, cryptographic algorithms, and security considerations.
i Identify and explain the key components required for the digital
signature system. What entities eg public keys, private keys,
certificates are essential for Alice and Bob to exchange secure
messages?
Marks
ii Describe the process of key generation for both Alice and Bob. How
are their public and private keys generated, and what measures should
be in place for secure key management?
Marks
iii. Outline the steps involved in Alice generating a digital signature for her
messages. Include details about the cryptographic operations and any
additional data that may be included in the signature.
Marks
iv Explain how Bob verifies the digital signatures received from Alice.
Highlight the cryptographic procedures involved in the verification
process and how Bob ensures the integrity and authenticity of the
messages
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