A digital multisignature method for facsimile-mail service

In the wake of the development of computer-aided facsimile equipment, office documents may be digitized, circulated on a network, and in the near future stored into files as soft copy. In this paper, we call this type of service facsimile-mail, and we discuss a multisignature method which is applied to facsimile documents. This method makes it possible to sign digital documents multi-plexively and simplify the document exchange process. Document management is simplified and the reliability of the network is improved.