This book constitutes the proceedings of the 7^th International Workshop on Graphical Models for Security, GramSec 2020, which took place on June 22, 2020.

The 7 full and 3 short papers presented in this volume were carefully reviewed and selected from 14 submissions.

Causal Model Extraction from Attack Trees to Attribute Malicious Insider Attacks.- Library-based Attack Tree Synthesis.- Asset-Centric Analysis and Visualisation of Attack Trees.- An attack simulation language for the IT domain.- Representing decision-makers in SGAM-H: The Smart Grid Architecture Model Extended with the Human Layer.- Breaking the cyber kill chain by modelling resource costs.- GroDDViewer: Dynamic Dual View of Android Malware.- Attack-Defence Frameworks: Argumentation-based Semantics for Attack-Defence Trees.- A diagrammatic approach to information flow in encrypted communication.- Contextualisation of Data Flow Diagrams for security analysis.

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