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Ray Atkinson, Graduate Student

Category: Homework

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Experience: Inner-city high school substitute teacher. Degrees in mathemetics, accounting, and education. Years and years of tutoring.

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10. (5 points) Double transposition ciphers were very secure

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10. (5 points) Double transposition ciphers were very secure hand encryption methods used during World War II by both the Allies and the Axis and is described in some detail here:

The key for the first transposition is DURABLE; the key for the second transposition is FIREWANDS. Decrypt the message (be sure to show your work)

11. (5 points) The message below is encrypted using an affine cipher (information about affine ciphers can be found here: http://en.wikipedia.org/wiki/Affine_cipher ) with a = 3 and b = 8. Decrypt the message.

SUHHC ODHGKNSIK IVR DIBBC VUW CUIH

An affine cipher is a monoalphabetic substitution cipher where the ciphertext is encrypted from the plaintext by the formula:

C(P) = (a x P + b) mod 26

7. (10 points) In your corporate environment the company depends heavily on the customer database for sales lead information and for revenue tracking. The database is hosted on a server in the corporate data center which is offsite. One day the power connection from the utility company to the data center is lost…however, the data center staff do not realize this as the data center immediately switched over to their backup diesel generator. Unfortunately the data center staff, not being aware that they were on backup power, never check the fuel level of the generator and it runs out of fuel. All of the systems in the data center go down. The outage lasts for 12 hours. Outage duration 12 hours Annual corporate revenue based on sales $12,000,000 Asset Value of corporate data center $500,000 Asset value of database server 10% of datacenter Annual Rate of Occurrence 1 in 100

Determine the following information:

a. Calculate the Single Loss Expectancy (SLE) (3 points) b. Calculate the Annual Loss Expectancy (ALE) (3 points) c. The cost of controls is the purchase of a UPS system for $1000. Determine the ALE after the controls (assume the ARO goes to 1 in 500) (2 points) d. Calculate the risk leverage (2 points)

The formula I have needs a value for "exposure factor." Is that computed from the information given? If so, do you have a better formula that I can use?

Yes, please convert it into a word document so that I can copy and paste in my home curate?which is a word document as well. Can you also ensure that the risk answer is demonstrated with steps and ac