Data packet`s undesirable access detecting method for e.g. virtual local area network, involves comparing parameter with records in control table and detecting undesirable access to packet if parameter corresponds to reference parameter

摘要

The method involves reading header-information of a data packet, and determining a parameter from the read header-information. The determined parameter is compared with records in a control table, in which a reference parameter is stored for all nodal points of a packet-based network having two computers (A, B). Undesirable access to the data packet is detected, if the determined parameter for none of the nodal points corresponds to the appropriate reference parameter in the control table. An independent claim is also included for a device for detecting undesirable access to a data packet of a man-in-the-middle-attack during transmission of the data packet between a transmitter-nodal point and a receiver-nodal point in a packet-based network.