Electronic circuit for securing data interchanges between a computer station and a network

An electronic circuit for securing data interchanges between a computer station and a network, said circuit comprising a first network interface connected to said network, said circuit comprising:

• a second network interface connected to a network interface of said computer station,
• a unit for processing data passing between the first network interface and the second network interface,
• an interface for connection to an internal bus of the computer station suitable for electrically connecting an electrical power supply, said electronic circuit not comprising any other means for transferring data to said station, said electronic securing circuit being mounted in a casing of the computer station so that only the network interfaces of said circuit are physically accessible from outside the computer station, an external network interface of the computer station being able to be linked to said second network interface of said circuit by a network cable connected to an outside of the casing of the computer station.