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You want to send a message to a friend and receive a reply using email over a network. What you are communicating is top secret and therefore you want to make sure it is going to your friend and that the communication is not viewable by others. (Be explicit on the process, keys, certificates, and encryption algorithms you will use in these following steps)

<!--[if !supportLists]-->a)     <!--[endif]-->How are you going to ensure that the message cannot be viewed by others but can be viewed by your friend?

<!--[if !supportLists]-->b)     <!--[endif]-->How will you ensure that the reply you received from your friend indeed came from your friend?

<!--[if !supportLists]-->c)     <!--[endif]-->How will you know if the reply that you received has not been tampered with before arrival?

<!--[if !supportLists]-->d)     <!--[endif]-->How can your process be breached (revealing the messages) and how difficult would it roughly to do so (process and time needed)?

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