The first one is A i thnk
I think the correct answer from the choices listed above is option D. The figure of speech being used here is a simile. The use of the word "as" shows that a simile is being used to compare the quality of the fleece to snow. Hope this answers the question. Have a nice day.
I think the questions that must be ask are:
a.What does “encryption” mean?
d.What are “key distribution problems”?
All the text is based on the concept "encryption" so it is very important to know what it means in order to undestand the rest of the information. If not, you will be missing important facts. In addition, there are a lot of words used that are derived from this one, so you won't be able to undestand them.
Another important concept that gives a lot of information just by knowing it's meaning is "key distribution problems", they could be two or a thousand, it is important to know what they are and what they do.
The other question that seems important is the one of the "public key cryphtography" but this one can be inferred by the context.
By 'author of the essay reading Shakespeare' do you mean us readers?
As, I'm currently doing right try and read classical novels like 'How to kill a mockingbird'. There's no need to rush if it's the first time reading, the more you read (or few of classicals) you will kind off get what the author is making the character speaking. Also understanding the aspect of the story. :)