METHODS AND APPARATUSES IN A DATA COMMUNICATION SYSTEM FOR PROVING AUTHENTICITY OF ELECTRONICALLY SIGNED HUMAN READABLE DATA

摘要

The present invention deals with a method performed by a communication apparatus (130, 135) of a data communication system for proving authenticity of electronically signed documents, the data communication system comprising the communication apparatus and a server (120). The method comprises receiving an invitation to electronically sign the document, presenting the document at a screen of the communication apparatus and detecting that a process of signing the human readable data is being performed. Thereafter, in response to detecting that a process of signing the human readable data is being performed, a screen-shot is taken of the screen, and the recorded screen-shot is sent to the server. At the server, another method is performed which appends the screen-shot to the electronically signed document and stores the screen-shot together with the electronically signed document for later use as evidence of a performance of the signing process. Further, the electronically signed document with its appended screen shot may in its turn be digitally signed and sealed, as a joint package.