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(i) (a) Provide a table showing the Caesar cipher with a key five, and then provide the result of applying this cipher to the text 'I came I saw I conquered'. (You can ignore the difference between upper- and lower-case letters.)(b) A three-letter word has been encrypted using a Caesar cipher. Someone wants to decrypt the word, and decides to simply list all three-letter combinations from which the cipher text might have been produced. (We assume that the key is unknown to this person.) How many three-letter combinations will there be in the list? Explain your answer.(c) Which is easier to break, the cipher used by an Enigma machine or a Caesar cipher?(ii) Digital signatures employ a message digest. Assume that you have to choose between two (admittedly rather simplistic) methods for calculating the message digest. The first method checks whether or not the message starts with an 'a', and if this is true it returns True, otherwise it returns False. The second method determines the number of 'a's in the message. So, for example, the message digest of 'Study Calendar' is False according to the first method and ture according to the second method. Which method is most secure? Explain your answer, demonstrating that you understand the notion of a message digest and its role in digital signatures.
(iii)(a) Describe in what respect asymmetric key cryptography is superior to symmetric key cryptography.(b) What is the main drawback of asymmetric key cryptography techniques?(c) For each of the following statements, state whether it is True, False or Indeterminate (i.e. there isn't sufficient information to tell whether it is True or False).1- SSL uses symmetric cryptography to send a key securely over the internet.2- SSL is very secure and efficient.3- SSL sometimes uses the same symmetric key more than once.4- SSL is efficient because it uses asymmetric key cryptography.5- SSL requires the computers between which data is transferred to know each other's private keys. (iv)(a) Which of the following passwords would you recommend, if you had to choose one? Explain your choice.1- ^&*74446757$2- Secret3- A1anTur!ng(b) Does choosing a secure password mean that you are safe once and for all?hide problem
Given that main memory is consisted of three page frames for public use and that seven-page program (with pages a, b, c, d, e, f, g) requests pages in the following order: a, b, a, c, d, a, e, f, g, c, b, g.
Discuss and explain some of the problems NATs develop for IPsec security. Solve this problems through using IPv6?
Suppose that you have been asked to consult for a corporation that has branch offices in four continents. You have implemented a management data system that will enable its managers to exchange information.
As was stated before, the corporation X is going to expand its data system. To do this, it is going to choose and buy new hardware and software and retrain workers.
Millions of American homes are prepared with wireless networks. Suppose if the network is not made secure, any nearby computer with a wireless card can use network.
Use the semaphore methods to control the concurrency of the solution
Will IBM's plan to give away some of its IT assets and intellectual property and increase its support of opensource software products like Linux be a successful growth strategy in the "brutally competitive marketplace" in which it operates?
Illustrate how many page faults are generated by following array-initialization loops, using LRU replacement, and assuming page frame 1 has process in it, and the other two are initially empty?
Write down the three parts of Linux kernel version number, and which is least probable to change? What are "BogoMIPS", and what is their significance?
Explain a complication that concurrent processing adds to an operating system.
How many page faults would occur under pure demand paging (all frames are initially empty), assuming four frames are available, under FIFO, LRU.
Suppose shared bank account exists between husband and wife and concurrently husband calls withdraw() function and wife calls deposit(). Explain how race condition is possible and what might be done to prevent race condition from occuring.
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