Part II: Answer the following questions, please be clear, concise, and use your own words with a maximum of 5 lines for each answer (out of 20): [ 4 points each ] 1. What kind of trials can be done in order to verify whether a block achieves diffusion or not. 2. The asymmetric crypto-system is far slower than the symmetric crypto-system; however, it is still used today in all the transactions online. Why? Provide 2 precise reasons. 3. State whether the following statement is true or false, justify your answer: "ifo is Euler's totient function, then o(nm) = (n) xo(m), for any integers n and m. 4. From the material discussed about the OTP answer the following: i. Write a short explanation of why one time pad is an unbreakable. ii. Explain why it is not practical to use one time pad in stream ciphers. 5. This question tests your understanding of how to use cryptographic algorithms: You have conducted business extensively over the Internet. To save the environment, you would like to secure your entire electrical communication by encrypting all the messages. Suggest the best practical method to achieve this goal (briefly explain how it works and what type of encryption algorithm you suggest to use)