Controlled delegation of signature in workflow systems
The fundamental concepts of this work are related to the proxy signature delegation in workflow systems. Many business processes rely on electronic documents. Therefore, organizations must properly protect the contents of an electronic document throughout its entire life cycle. Proxy digital scheme does not provide control over whether the proxy signer is allowed to accept delegation concerning the separation of duties, neither does it treat other possible delegation constraints. With proxy signature it is particularly important to prove whether the delegator is the authorized signer. The delegation of signature is constructed using the advantage of the RBAC model which is widely adopted in the current workflow management systems. This paper defines the controlled proxy signature model based on the role-based access control model. The central idea of this proposed model is that by controlling the delegation of tasks we are controlling the delegation of signature.