Never trust, always verify, applied to real systems.

Writing on Zero Trust

• Jun 1, 2026 12 min read

  Entra Agent ID Across Clouds: Part 5, Anti-Patterns

  Final article in the five-part series on running Microsoft Entra Agent ID against third-party clouds. Closes the loop with the variants and failure modes that consume the same operational budget as the federated pattern without delivering its security properties, and ends with the takeaways worth pinning to the team wiki.

  Digital Identity Zero Trust Read →
• May 15, 2026 16 min read

  Entra Agent ID Across Clouds: Part 4, FIC, Cross-Tenant, and OBO

  Fourth article in the five-part series on running Microsoft Entra Agent ID against third-party clouds. Opens up the Federated Identity Credential as a first-class object: single-tenant, cross-tenant SaaS shape, and the orthogonal world of on-behalf-of (OBO) where the agent acts for a signed-in user.

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• May 1, 2026 26 min read

  Entra Agent ID Across Clouds: Part 3, Managed Identity and Entra Objects

  Third article in the five-part series on running Microsoft Entra Agent ID against third-party clouds. Pins down what the UAMI actually is in this architecture, why SAMI breaks federation, the three distinct Entra objects (UAMI, Blueprint, Agent Identity) and the three claims (sub, azp, oid) they each populate, and the production trade-off between federating the UAMI or the Agent Identity to the cloud.

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• Apr 25, 2026 26 min read

  Entra Agent ID Across Clouds: Part 2, Federation End to End

  Second article in the five-part series on running Microsoft Entra Agent ID against third-party clouds. Walks the federated pattern as two parallel federations sharing one managed-identity JWT, explains why a laptop cannot participate, and shows what actually travels on the wire (including the audience GUID that catches most first deploys).

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• Apr 15, 2026 15 min read

  Entra Agent ID Across Clouds: Part 1, Lower Environment and Secrets

  The opening article in a five-part series on running Microsoft Entra Agent ID against third-party clouds (AWS, GCP). Covers the two trust environments behind every cloud-agent deployment, and walks the secret-based pattern (the shape you use on a laptop, on a CI runner, or in any non-Azure dev box) end to end.

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• Aug 10, 2020 1 min read

  Podcast: Security Patterns For Client-Side Apps Running In The Browser

  Great to have Dr. Philippe De Ryck on the podcast. He talked about various security challenges faced by developers while working with client-side applications.

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• Feb 21, 2016 17 min read

  Using Client Certificate Authentication for Web API Hosted in Azure

  During recent customer engagement there was a discussion around client certificate [a.k.a tls mutual] authentication and how to use it with asp.net web api that is hosted on azure as a azure api app.

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