Process and apparatus for the manufacture of documents protected against counterfeiting and misuse, and document used therein

摘要: 1. A method of producing and later checking documents which are to be protected from counterfeiting, falsification misuse using a pair codes or algorithms connected via "trap-door" function consist code (B) has kept secret (A) does not have secret, wherein uncoded information in clear (K) is entered on the document during its preparation, coded (C) derived clear, algorithm likewise protected, wherein, document, decoded thus obtained compared with present validity made evident reference result comparison characterised that, preparation stored store (4) accessible outside (3) outside, that following an external start instruction, decoding carried out circuit stages (12, 13) provided itself outside.