Q1: What are substitution ciphers? How do they differ from one-time pads? Which is better for the IS manager to employ? Explain your answer.
Q2: What is the Data Encryption Standard (DES)? What is triple DES? How did the Rijndael protocol enhance DES?
Q3: What is an intrusion detection system (IDS)? What are the two types of IDS? Provide examples of at least three things that a properly configured IDS does for the IS manager.
Q4: Is intrusion prevention a proactive or reactive approach? Why? Provide an example. What is a digital signature? How does digital signature enhance the authenticity and integrity of data? Provide at least two examples.
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