METHOD AND DEVICE FOR SAFEGUARDING OF A DOCUMENT WITH INSERTED SIGNATURE IMAGE AND BIOMETRIC DATA IN A COMPUTER SYSTEM

A method for safeguarding an electronic document includes inserting at least one digital signature image into the electronic document and generating a first check sum for the electronic document, with or without optionally-inserted biometric signature data, using a first hash function. A second check sum is then generated using a second hash function. The first check sum and the biometric data, if provided, are then symmetrically encrypted using a key that is the sum of the second check sum and a generated random value. The symmetrically-encrypted first check sum is attached to the document. The random value is then asymmetrically encrypted using a first public key of a first key pair and the asymmetrically-encrypted random value is added to the document.