Encryption services. Pretty Good Privacy (PGP)

There are many ways to provide encryption services. Pretty Good Privacy (PGP) is one example of an encryption package that is readily available.

Out of the 5 principal services that are provided by PGP, which services do you find the most important? Explain your answer in detail.

Why does PGP generate a signature before adding compression?
What is your opinion about the security effectiveness of PGP? Support your answer with credible research.
Would you use PGP or a different encryption package? Explain your answer in detail.
How would you implement PGP in your own company or at home?
What are some situations where PGP would not be the best encryption package for an organization?

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