Friedman test. Kolchak’s cipher. Vigenère autokey cipherGrošek, Otokar, 1950- Remarks on breaking the Vigenère autokey cipher / aut. Otokar Grošek, Eugen Antal, Tomáš Fabšič. -- 000469567400001. -- 000469567400001. -- 10.1080/01611194.2019.1596997. Antal, Eugen, 1987-. Fabšič, Tomáš, 1986- In: Cryptologia. -- ISSN 0161-1194. -- Vol. 43, Iss. 6 (2019), s. 486-496.