Importance of random numbers in PGP

1. Brief the origin of PGP.

2. What is meant by ‘signing’ a document?

3. Explain the importance of random numbers in PGP message generation.

1. List out the components contained in the outcome of PGP encryption.

2. What are the shortcomings of S/MIME, and how can it be rectified?

3. Mention any features to add with S/MIME or enhance any feature of S/MIME and How?