# Computer SecurityHomework 1 Solved

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Please complete the following problems, being sure to explain your conclusions or show your work when such details are requested. Your solutions must be submitted to Canvas as a PDF file.

This assignment is to be completed individually â€“ plagiarism and cheating are strictly prohibited and are punishable.

Chapter 1:

1. Complete Problem 10 (a, b) from the text. The German Enigma is…
2. Consider the definitions of confidentiality, integrity, and availability.
• When might each of these aspects of information security be more important than the others?
• Describe a few situations where strengthening one of these might weaken another.

Chapter 2:

1. Complete Problem 8 (a, b, c, d) from the text. This problem deals with the concepts of confusion…
2. Complete Problem 19 (a, b) from the text. Using the letter encodings in Table 2.1, the following…
3. Complete Problem 29 (a, b, c, d) from the text. Suppose that Alice encrypted a message with a…
4. Suppose a cipher uses a 10-character mixed-case alphanumeric key (0-9, a-z, A-Z).
• What is the size of the keyspace (i.e., how many unique keys are possible)?
• What is the approximate strength of the key, measured in bits? Hint: rewrite the size of the keyspace as a power of two.
• If a particular computer can test 240 keys per second, how long will it take (on average) to guess the key of this cipher?
• hw1.zip