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Explain the life cycle of an information system.Apply the steps of the life cycle to the scenario listed below.
Suppose that you run a photography printing store. Your workers have been using punch cards for time entry since you started the business. This has lead to many problems including lost cards, inaccurate hours, and employees punching in other employees. Because of these problems you are considering implementing a computerized time entry system. Describe each step of the life cycle, and apply it to your problem in your business.
You were given the following plaintext and cipertext, and you are needed to find key used by them. plaintext: Using Vigene table, find key used by them to encrypt the message.
Students would enter the room, pick up their jobs, and leave. What kinds of security problems might computer services encounter with a system such as this?
Deliver a research paper and presentation based on your research - Future threats to network security and planning for those threats
Security topology covers four primary areas of concern (design goals, security zones, technologies, and business requirements). Describe each area including key topics in each area. Discuss software threats.
Describe a procedure that selects a key uniformly at random from among the keys in the hash table and returns it in expected time O(L.(1 + 1/α)).
Describe network crimes that are related to DNS entry alteration or bogus DNS servers. In a network investigation, some network administrators may be cooperative while others may not.
The size of the frame is long enough to guarantee the detection of collision by both stations. Find: The time when station C hears the collision (t3).
What RC4 key value will completely invert S after the initial permutation (so that S[0] = 255, S[1] = 254, ..., S[254] = 1, S[255] = 0)? Show your work. (Explain how you got this.)
Explain how message gets from Alice's host to Bob's host. Make sure to list series of application-layer protocols which are used to move message between the two hosts.
Another variation of Additive cipher uses a keyword instead of a single key. This cipher is called Vigenere cipher. Both variations work exactly the same.
Assume that evil Charlie eavesdropped on Bob's message to server. How can he with the help of his equally evil buddy Don, extract key K that Alice and Bob are using to protect their communications?
Suppose that eight more characters were added to the password and that the DES algorithm was changed so as to use all 16 password characters. What would be the expected time to find all users' passwords using a dictionary attack?
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