The present invention provides a system, method and device, for carrying out secure electronic communication over a computer network via a computer susceptible of being virus infected or eavesdropped by means of a personal apparatus comprising processing means, one or more memory devices, one or more interfacing means suitable for exchanging information with the insecure computer, and a communication software having cryptographic capabilities stored in the one or more memory means, wherein the personal apparatus is adapted to establish a secure channel with a remote computer over the computer network, by means of the insecure computer machine.