Learn to implement secure OAuth 2.0 and API key authentication in Java/SpringBoot. Build real-world login flows, defend against common vulnerabilities, and integrate robust authentication for modern applications.

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Course 1

OAuth Fundamentals & Mock Implementation

5 lessons

12 practices

This course introduces OAuth 2.0 authentication using mock Google providers. Learn OAuth fundamentals, implement authorization code flow, and integrate with your Java/Spring Boot pastebin application. Follows an offense-defense approach, demonstrating vulnerabilities before implementing secure solutions.

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Course 2

OAuth Advanced Features & Integration

3 lessons

Course 3

API Key Authentication & Security

3 lessons

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Tech consultant

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Senior Machine Learning Engineer

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I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

Build upon OAuth fundamentals to implement account linking, unified authentication, and error handling. Create production-ready OAuth systems with mock providers. Learn to identify common security pitfalls and implement robust defensive measures for real-world OAuth integrations.

This course covers implementing basic API key authentication alongside your existing OAuth system. You will learn to generate API keys, authenticate requests, and manage key security. The course follows an **offense-defense approach**, demonstrating simple API key vulnerabilities before implementing secure solutions.