Antonio Sanso

ANTONIO SANSO works as Senior Software Engineer at Adobe Research, Switzerland, where he is part of the Adobe Experience Manager security team. Prior to this, he worked as software engineer in the IBM Dublin Software Lab in Ireland. He found vulnerabilities in popular software, such as OpenSSL, Google Chrome, and Apple Safari, and he is included in the Google, Facebook, Microsoft, Paypal, and Github security hall of fame. He is an avid open source contributor, being the Vice President (chair) for Apache Oltu and a PMC member for Apache Sling. His working interests range from web application security to cryptography. Antonio is also the author of more than a dozen computer security patents and applied cryptography academic papers. He holds an MSc in Computer Science.

books by Antonio Sanso

OAuth 2 in Action, Second Edition
  • MEAP began October 2026
  • Last updated October 2026
  • Publication in Spring 2027 (estimated)
  • ISBN 9781633433083
  • 375 pages (estimated)

OAuth 2 in Action, Second Edition is the definitive guide to OAuth, the protocol that secures APIs across the internet. Extensively revised for its second edition, this new version is fully up to date with the latest best practices, new grant types, modern client patterns, and the growing ecosystem of standards built on top of OAuth 2. You’ll learn to confidently and securely build and deploy OAuth for the client, the authorization server, and the protected resource.

You’ll start with a clear overview of OAuth’s actors, tokens, scopes, and flows, and then get hands-on by building each component from the ground up. From there, you’ll dig into common implementation vulnerabilities and how to defend against them, structured tokens and JWTs, dynamic client registration, and OpenID Connect for authentication. By the end, you’ll be equipped to make sound design decisions and deploy OAuth-based systems that hold up under real-world conditions.

The new edition captures the shifting landscape of OAuth, including PKCE and the new specifications that have emerged to address real-world deployment challenges. You’ll find substantial new content on OAuth 2.1, Pushed Authorization Requests, Rich Authorization Requests, and Token Exchange, as well as covering the device code grant, DPoP for proof-of-possession tokens, HTTP Message Signatures, and more. You’ll also explore the wider protocol ecosystem, from GNAP, FAPI and Open Banking, to SMART on FHIR in healthcare, and how OAuth intersects with newer patterns like the Model Context Protocol (MCP) and workload identity.

Clear code examples in Python, detailed system and flow diagrams, and practical exercises walk you through every concept. Whether you’re an application developer integrating with an API, an architect designing a secure system, or an engineer protecting a REST service, this book gives you the depth and perspective you need to work with OAuth 2.0 with confidence.

Understanding API Security
  • February 2017
  • ISBN 9781617294327
  • 205 pages
Included with a Manning Online subscription
resources: OAuth 2 in Action Irresistible APIs SPA Design and Architecture Building the Web of Things Amazon Web Services in Action SOA Security

Gone are the days when it was acceptable for a piece of software to live in its own little silo, disconnected from the outside world. Today, services are expected to be available for programming, mixing, and building into new applications. The web-based Application Programming Interface, or API, is how services make themselves available in this dynamic world. By exposing an API, a service can find new life and utility far beyond what its core functionality was designed to be. But these APIs need to be secured and protected in order to be truly useful. An API that's simply left open to everyone, with no security controls, cannot be used to protect personalized or sensitive information, which severely limits its usefulness.

The OAuth delegation and authorization protocol is one of the most popular standards for API security today. Understanding API Security is a selection of chapters from several Manning books that give you some context for how API security works in the real world by showing how APIs are put together and how the OAuth protocol can be used to protect them.