This book constitutes the proceedings of the 15th International Workshop on Security and Trust Management, STM 2019, held in Luxembourg City, Luxembourg, in September 2019, and co-located with the 24th European Symposium Research in Computer Security, ESORICS 2019.

Improving Identity and Authentication Assurance in Research and Education Federations.- Audit-Based Access Control with a Distributed Ledger: Applications to Healthcare Organizations.- Is a Smarter Grid Also Riskier.- BioID: a Privacy-Friendly Identity Document.- On the Statistical Detection of Adversarial Instances over Encrypted Data.- Understanding Attestation: Analyzing Protocols that use Quotes.- Challenges of Using Trusted Computing for Collaborative Data Processing.- Secure Trust Evaluation Using Multipath and Referral Chain Methods.- Personal Cross-Platform Reputation.- An OBDD-based Technique for the Efficient Synthesis of Garbled Circuits.

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