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This book constitutes the refereed proceedings of the 6th International Symposium on Engineering Secure Software and Systems, ESSoS 2014, held in Munich, Germany, in February 2014. The 11 full papers presented together with 4 idea papers were carefully reviewed and selected from 55 submissions. The symposium features the following topics: model-based security, formal methods, web and mobile security and applications.

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Model-Based Security.- Detecting Code Reuse Attacks with a Model of Conformant Program Execution.- Security@Runtime : A Flexible MDE Approach to Enforce Fine-Grained Security Policies.- Idea: Towards a Vision of Engineering Controlled Interaction Execution for Information Services.- Formal Methods.- Automated Formal Verification of Application-Specific Security Properties .- Fault-Tolerant Non-interference .- Quantitative Security Analysis for Programs with Low Input and Noisy Output.- A Modeling and Formal Approach for the Precise Specification of Security Patterns.- On the Relation between Redactable and Sanitizable Signature Schemes.- Idea: Towards a Working Fully Homomorphic Crypto-processor: Practice and the Secret Computer.- Web and Mobile Security.- Architectures for Inlining Security Monitors in Web Applications.- Automatic and Robust Client-Side Protection for Cookie-Based Sessions.- Security Testing of GSM Implementations.- Applications.- User-Centric Security Assessment of Software Configurations: A Case Study.- Idea: Security Engineering Principles for Day Two Car2X Applications .- Idea: Embedded Fault Injection Simulator on Smartcard.

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