Patent ID: 7761716

Claim:
A process for securing a man-machine dialog between a human user and a digital signature device application, comprising: selecting the digital signature device application from a plurality of applications on a terminal which may be executed on the terminal, whereby communication between the human user and the digital signature device application is achieved by means of at least one input channel on the terminal through which the user provides input communication to the terminal and at least one output channel on the terminal through which output communication is provided to the user, wherein the output channel comprises a display; selectively switching the input channel and/or the output channel of the terminal together or separately such that one or both channels are only available to the digital signature device application exclusively and the input/output channels are allocated exclusively to only said digital signature device application at a time, wherein the digital signature device application is itself present in a chip card that can be used with the terminal or is in the terminal itself; wherein the digital signature device application comprises the following steps: a document to be signed is sent from a signature requesting location to the terminal and the document is displayed on the display, the user enters data to verify the authenticity of the user, the digital signature device application checks the authenticity of the verifying data, and the document is signed and then sent back to the requesting location.