A new security service non-repudiation of mutual agreement

Up to now no non-repudiation service is spezified thar is able to prove the settlement of a mutual agreement carried out by electronic data communication. Usually all parties to an agreement would sign the same document exposing the object of the agreement, for instance, an agreement to rent a house. That contract protects any signatory of each other's false denial having entered into the agreement. On the other hand the contract proves the settlement of that agreement against any third party. To achieve this service a new non-repudiation mechanism is presented within this contribution. It is based on the electronic pendant of the band-written signature, the digital signature. All actions to be done are serialized so that digital signatures and confirmations could be calculated by several signatories step by step.