Assignment
This problem uses a real world example of a symmetric cipher from an old US Special Forces manual. Use the very simple example of the cipher from he class lecture to help you answer this assignment.
a) Using the two keys (memory words) cryptographic and network security, encrypt the following message:
Be at the third pillar from the left outside of the lyceum theatre tonight at seven. If you are distrustful, bring two friends.
Make reasonable assumptions about how to treat redundant letters and excess letters in the memory words and how to treat spaces and punctuation. Indicate what your assumptions are.
b) Decrypt the cyphertext. Show your work.
c) Comment on when it would be appropriate to use this technique and what its advantages are.
For each of the following situations, assign a low, moderate, or high impact level for the loss of confidentiality, availability, and integrity, respectively. Justify your answers.
1) The University of New Haven’s public information Web server.
2) The University of New Haven’s Student Registration information.
3) A local law enforcement organization’s public information and confidential tip line Web server.
4) An information system used by the University of New Haven’s Human Resources department for employee information and for routine administrative information. Assess the impact for the two data sets separately and the information system as a whole.
5) The sewage treatment plant in West Haven contains a SCADA (supervisory control and data acquisition) system controlling the treatment of wastewater for the city of West Haven and for a portion of New Haven. The SCADA system contains both real-time sensor data and routine administrative information. Assess the impact for the two data sets separately and the information system as a whole.
Journal Question
Out of confidentiality, integrity, and availability, which would have the most serious consequences if it were breached? Explain your reasoning. What is one way attackers could use cryptography against a target?