লিখেছেন বইলেখক:حكيم الامت مولانا اشرف علي تهانوي رح ( হাকীমুল উম্মত মাওলানা আশরাফ আলী থানভী রহ.)
a very solid book on cryptanalysis. it's just a little dry the entire time (you must have your own motivation to get through this one) and hard to follow (most of the time).
