Method and arrangement for protecting the access to a computer

Abstract

Abstract A method and an arrangement are specified by means of which the transmission of data between a remotely positioned terminal (10) and a computer (14) can be transmitted in a protected manner. A protection unit (12) allocated to the terminal (10) transmits an access request via a telephone line to the computer and subsequently transmits via the telephone line in plain text a first message which contains an identification number allocated to the identification unit (12) and encodes a second message consisting of a personal identification character chain which is input by a terminal user into the terminal, of a first internal identification word which is automatically generated by the protection unit and of the telephone number of the calling telephone. The protection unit subsequently interrupts the connection to the computer. It waits for a call back from the computer (14) and, in this case, transmits via the telephone line a fourth message which acknowledges the call back and encodes a fourth message which contains the data to be transmitted. <IMAGE>

Inventors

• 👤 John R. Dr. Michener

Bibliographic Details