m99

I don't want to use C4.5 but SVM. It is not diffrence in this case, important for me is feature vector that represents encrypted file, and I have problems with getting this vector.

Hi I have a question between math and computer science. What I want to do is write some tool that recognizes what is encryption algorithm of cipher text. I want to do it using support vector machine. I found article about representation of encrypted file as a 10 features vector, but I have problem with calculate it. I would be very grateful if somebody helped me how to do this. Here is my article: Article and here is the beginning of this. I don't know exactly what author means by "maximum entropy", especially of 3 and 4 grams. Best regards Michael