Warm-Up 8, Due Thursday, March 25, before class.

Please answer each question in three or more sentences. It is OK to answer 'I don't know' - but try and state why you are confused! No late Warm Ups are accepted for any reason, and only those submitted electronically through this web page (or by email, if the web page has technical problems) are considered.

Your Name:

Question 1

What is the difference between public key encryption and the older versions of encryption?

Question 2

Explain why it suffices to have an encryption method that takes numbers and changes them into different numbers, even though you don't want to send numbers as messages but rather text.

Question 3

If you want to encrypt a message whose corresponding number is 103, and if the public key is 5 with computations done modulo 221, what would the encrypted message be?