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Figures to illustrate the lecture on Basic encryption

Visual aids for basic encryption lecture covering frequency of English text, Vigenere tableau, cryptanalysis methods like Kasiski, using statistics for analysis. Figures to save time in reproducing large tables. Refer to lectures for full details.

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Figures to illustrate the lecture on Basic encryption

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  1. Figures to illustrate the lecture on Basic encryption Note: These figures are only meant to help illustrating a few points. (The goal is to save time in reproducing large tables & figures on the board and coping them in the notebooks.) There are other important points covered in class that are not given in the following slides. Please refer to the lectures and the text book for details.

  2. Using simple statistics and properties of the language for cryptanalysis • Frequency of letters in English text: • (A, E, O, T) is approximately 40% (38.71% in the above table) • (A, E, O, T, N, I) is approximately 50% (52.10 in the above table)

  3. a o u Polyalphabetic substitution Vigenere tableau (26 x 26 matrix) The cipher letter ci is found in the pi-throw and ki-th column

  4. Cryptanalysis of polyalphabetic substitutions: Kasiski method for repeated patterns Key: dickens Plain text

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