Abstract: A one-way data communication link implementation method and system are presented. It is used to insure no covert channels exist between a transmitter system and receiver system. Covert channels can be used to pass information, for unauthorized purposes. Thus covert channels must be eliminated, if an information system or network is to be considered secure. The one-way link is an essential security tool for constructing secure information systems and networks. An example use of a one-way link is given for a system which acts as a communications front-end (CFE) module to a system it is protecting. The one-way link is use to transfer data in only a single direction from a protected system to the CFE-Module.