Method and encryption system for secure data transmission

A method for secured transmission of messages between at least two users of a telecommunications network by means of a secret random binary key of great length described, which is only once used for encryption. This key is generated in a preferably public accessible key generator (10) for example by means of an optical random with beam splitter, in at least two portable data carrier (12), such. As CDs, enrolled and then output in this form to the user, each receive a disk (12) and the inscribed key. Another storage of the key does not take place. Its users give this key support (12) now in reading devices (14) that such. As are respectively assigned to telephones, fax machines or PCs to telecommunications transmission devices (16), used by them. When you connect the proper entry of the keys and their compliance is checked by logistic facilities (18) that the telecommunication transmission devices (16) are each also assigned and when encrypting and decrypting the information to be provided information for a synchronization of the key input or at least parts of key worry. There is also described a system for carrying out this Verfahres with the necessary facilities for this purpose.