Actor-Network Procedures

In this paper we propose actor-networks as a formal model of computation in heterogenous networks of computers, humans and their devices, where these new procedures run; and we introduce Procedure Derivation Logic (PDL) as a framework for reasoning about security in actor-networks, as an extension of our previous Protocol Derivation Logic. Both formalisms are geared towards graphic reasoning. We illustrate its workings by analysing a popular form of two-factor authentication