Q. The acronym for the three defining principles of security is CIA.

What does each letter stand for?

In a paragraph or two define each defining principle.

Q. Create a short description of each threat described in the lecture slides.

Q. What are the three main categories of cyber threat?

Q. Choose two threats from those in the previous question and comment on the Likkelihood and impact of each on you as an Internet users.

Q. Describe two challenges that confront cybercrime enforcement agencies.

Cryptography

Q. Using the Internet describe the defining event that provided the British to break the encryption code used by the Germans in the second world war.

Q. The cipher used by the Lorenz SZ42 behaved as follows:

plain_text XOR key = cipher_text

cipher_text XOR key = plain_text

Using an 8 bit character of plain text and an associated 8 bit key, verify that the above relationship between plain_text and cipher_text holds true.

Q. Describe the differences between symmetric key and asymmetric key encryption techniques.

Your description should include the following:

• Number of keys used
• Typical size of keys
• Computing power required to encrypt/decrypt
• PLEASE PROVIDE EXPLANATION AND SCREEN SHORT.