Method and system for generating a digital signature and authenticating the same on a document

Disclosed is a method and a system for generating and authenticating a digital signature on a document bearing a client's autograph. The method includes the followings: * generating a digital image with respect to a document bearing a client's autograph and storing the digital image in a cloud service; * logging onto the cloud service by a signing party, the signing party causing a signature image merged to the digital image and signing the digital image using a certificate to produce a digital signature information; * receiving the digital signature information and the digital image by an authenticating party and authenticating the digital image with the digital signature information; and * displaying the digital image merged with the signature image at the authenticating party if the digital image is authenticated, or displaying the digital image with the signature image covered with a mask or a mark indicative of an authentication failure on the signature image If not authenticated.