ACM SIGecom Exchanges
An intensive survey of fair non-repudiation protocols
Computer Communications
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A signature policy collects the rules to create and validate electronic signatures under which they become binding in a particular transactional context. These policies have been widely adopted to enforce the binding property of signatures in business scenarios. However, current standards only cover the definition of the requirements to be fulfilled by a single signature. As a consequence, business models where more than one signature is required in order to make the transaction effective cannot adhere to the benefits of signature policies. This paper is the first to propose a solution where the dependences and relationships among the signatures generated in the same transaction can be established. In particular, the ASN.1 definition of an extended signature policy is presented along with the procedures to be followed by the transacting parties. This work will be submitted to the IETF PKIX Work Group to be considered as an Experimental Request For Comments document (RFC).