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In the scriptoriums of the early Middle Ages cryptographs were liked very much and spread. There was a big number of codes which can be summarised systematically, nevertheless, on few procedures. Substitution codes were prevailing. Their deciphering does not pose many problems to us. Mysteriously they appear to us because her purpose is not clear. The paper offers a small overview about the medieval cryptography, in particular in the area of the historical tradition of German language and discusses functional questions of the attractive phenomenon.