m99 Posted February 28, 2011 Posted February 28, 2011 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
khaled Posted March 1, 2011 Posted March 1, 2011 It seem you have to work on this starting from building your model, after looking at the papers briefly, I assume you have to work with C4.5 Algorithm & the Decision Tree ...
m99 Posted March 1, 2011 Author Posted March 1, 2011 It seem you have to work on this starting from building your model, after looking at the papers briefly,I assume you have to work with C4.5 Algorithm & the Decision Tree ... 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.
khaled Posted March 2, 2011 Posted March 2, 2011 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. About SVM: en.wikipedia.org/wiki/Support_vector_machine Feature Extraction: in Attachments ... No 252 - Mazibuko.pdf
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