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welcome to this video abstract about the paper differential crypts analysis in the fixed key model which iamp;#39;ll be presenting at crypto on wednesday todayamp;#39;s paper is about differential cryptanalysis what weamp;#39;re going to be doing here is we have a function f and weamp;#39;re going to take an input x and weamp;#39;re going to add a difference a to it and then weamp;#39;re going to see if the output pair that we get has a certain difference b and ideally we would like to find a pair of differences a and b also known as a differential so that there are many solutions x to this different equation and the number of solutions divided by 2 to the n is what we call the probability of the differential so the basic problem here is how do we compute this probability and this is a difficult problem because our function f is something complicated like a block cipher so one technique that we can use for this is known as differential characteristics and it assumes that this fun