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Answer the following questions : 1. The total processing speed of microprocessors (based on clock rate and number of circuits) is doubling roughly every year. Today, a symmetric session key needs to be 100 bits long to be considered strong. How long will a symmetric session key have to be in 30 years to be considered strong? - 5 Marks 2. How do NIST criteria for selection of DES and AES relate to Shanon's original standards of a good cryptographic system? What are the significant differences? How do these standards reflect a changed environment many years after Shannon wrote his standards? - 15 Marks 3. A program is written to compute the sum of the integers from 1 to 10. The programmer, well trained in reusability and maintainability, writes the program so that it computes the sum of the numbers from k to n. However, a team of security specialists scrutinizes the code. The team certifies that this program properly sets k to 1 and n to 10; therefore, the program is certified as being properly restricted in that it always operates on precisely the range 1 to 10. (a) Explain different ways that this program can be sabotaged so that during execution it computes a different sum, for example, 3 to 20. - 10 Marks (b) One means of limiting the effect of an untrusted program is confinement: controlling what processes have access to the untrusted program and what access the program has to other processes and data. Explain how confinement would apply to the above example. - 15 Marks 4. The distinction between a covert storage channel and a covert timing channel is not clear-cut. Every timing can be transformed into an equivalent storage channel. Explain how this transformation could be done. - 15 Marks Part B : 20 Marks 1. Research the TJX data breach case on the web and answer the following questions. a. Was the TJX break-in due to a single security weakness or multiple security weaknesses? Explain. b. Suggest a set of measures which probably would have prevented the TJX data breach. Justify your answer. c. Which of the CIA goals did TJX fail to achieve in this attack? Rationale This assessment task is based on the following topics discussed in the subject: the overview of Information security fundamentals, security threats, cryptography, malicious software and its countermeasures, operating system security and software security . The assessment task is aligned with the following learning outcomes of the subject: On successful completion of this subject, students will be able to justify security goals and the importance of maintaining the secure computing environment against digital threats; be able to explain the fundamental concepts of cryptographic algorithms; be able to examine malicious activities that may affect the security of a computer program and justify the choice of various controls to mitigate threats.

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ACC 611 Taxation Law and Practice

Smith & Jones and Associates (SJA) is a legal firm located in the Brisbane CBD. SJA own the building from which it operates and also where all of the staff park their private vehicles whilst at work. The building was purchased in 2004. The partners, Steven Smith and Larissa Jones also park th ...

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Q

Engineered Extraction Systems

Engineered Extraction Systems Australia Pty Ltd designs and manufactures custom-made high performance automotive exhaust extraction systems for the Australian motor racing industry and the automotive after-market. The business was established in Adelaide by two part-time motor-racing drivers in 1 ...

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Accounting Theory

The relationship between accounting research and professional practice has been discussed in the literature (Parker, Guthrie & Linacre 2011). With regard to management accounting the gap between research and practice has been studied from the viewpoint of academics (Tucker & Parker 2014)and ...

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Q

EENG725: Queuing Theory

You can make use of the following • P∞ n=1 x n−1 = 1 1−x ; |x| < 1. • If X(t) ∼ Poisson(λ), then Pr{X(t) = k} = e−λt(λt) k k! , k = 0, 1, 2, · · ·. • A continuous random variable, X uniformly distributed in [a, b ...

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