Describe the following modes of operation of a block cipher: electronic codebook, cipher block chaining, output remarks,

Fantastic news! We've Found the answer you've been seeking!

Question:

Describe the following modes of operation of a block cipher: electronic codebook, cipher block chaining, output remarks, cipher feedback, message authentication code and hash feature. [12 marks] With which of those modes would it not typically be unwise to use the Data Encryption Standard set of rules? [3 marks] How would you choose a method of operation to defend the confidentiality of records traffic on a radio link with acknowledged prices of (a) bit mistakes and (b) burst errors inflicting lack of synchronisation?

Define the sorts and phrases of the language PCF. Describe the denotational semantics of PCF the use of domains and non-stop features. In what feel is the denotational semantics of PCF compositional? [12 marks] Explain the soundness and adequacy homes of the denotational semantics with admire to the operational semantics of PCF. (A definition of the PCF operational semantics want now not receive.) [4 marks] Define the belief of contextual equivalence for PCF phrases. Explain why the compositional, soundness and adequacy homes referred to above suggest that if closed PCF phrases of the equal type have identical denotation, then they're contextually equal. [4 marks] 11 Information Theory and Coding The statistics in continuous but bandlimited alerts is quantised, in that such non-stop alerts may be absolutely represented by a finite set of discrete numbers. Explain this principle in each of the subsequent 4 essential contexts or theorems. Be as quantitative as feasible: (a) The Nyquist Sampling Theorem. [5 marks] (b) Logan's Theorem. [5 marks] (c) Gabor Wavelet Logons and the Information Diagram. [5 marks] (d) The Noisy Channel Coding Theorem (relation among channel bandwidth W, noise strength spectral density N0, sign energy P or sign-to-noise ratio P/N0W, and channel capability C in bits/2d). [5 marks] 12 Computer Vision Discuss the r?ole of non-linear operators in imaginative and prescient for the extraction of movement statistics, texture records, colour records, and stereo statistics. What are the restrictions of linear operators (consisting of filters) as compared with non-linear ones? What is a quadrature pair, and what's a Hilbert pair? What is a Hilbert Transform, and what is a herbal way to construct a useful non-linear operator from it?