In cryptanalysis of an unknown cipher first step is to identify the cipher and then to break it. To identify the cipher we need to classify them. Classifying ciphers means identifying the cipher, which has resulted the given ciphertext encrypted by that unknown cipher.
In this thesis, classification of classical ciphers was done with very good accuracy. For classification of modern ciphers like DES and IDEA, several schemes have been examined. Slightly positive results were obtained for modern ciphers classification.
Full Thesis (PS-gzipped: 115K)