the entropy of the following systems and order them according to increasing security (a) A 6 digit PIN code with exactly 5 different numbers (b) A 6 digit PIN code with exactly 4 different numbers (c) A 9 character password with lower- and upper-case letters and numbers, where all the numbers are at the end. (d) A passface scheme with four 5x5 grids and three 6x6 grids, each containing 1 face for recognition (e) A combination of the passface and DejaVu system with six 5x5 grids. On each of the first 3 grids there is 1 face to recognize and on each of the last 3 grids there are 2 faces to recognize   ----------------------- Thank's Abdulrahim Taysir

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