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Auth2 Explained: The Essential Guide for Developers and Architects

What is Auth2?

Auth2, also known as OAuth 2.0, is an industry-standard authorization system that allows a website or application (client) on behalf of a user to access resources hosted by another website or application (resource server). It provides secure delegated access without requiring the client to store or expose the user's credentials.

Brief History

Released: OAuth 2.0 was first released in 2010 as a replacement for OAuth 1.0.
Alternatives: Prior to Auth2, solutions such as SAML and Basic Authentication were used, but they had limitations like complexity, security issues, and a lack of flexibility.

Key Features:

Security: Securely grants access to resources without sharing user credentials.
Simplicity: Easier for developers to implement compared to other authorization protocols.
Flexibility: Supports various authorization flows for different applications and devices.
Widely adopted: Used by major websites and applications like Google, Facebook, and Twitter.

Differences between SAML vs OpenID Connect

For any architect, most crucial thing is to decide the best alternatives for their solutions. So here is the basic idea when to use one over other -

SAML: This protocol is ideal for large organisations with complicated security needs and the need for SSO across several apps.

OpenID Connect: This is appropriate for online and mobile apps that require easy authentication and authorization as well as quicker integration.

Advantages of Auth2:

Improved security: No need to store or share user credentials directly.
Ease of Use: Simpler implementation for developers and a better user experience.
Wide Adoption: Most major online services and apps support widespread adoption.
Scalability: Easily handles huge amounts of authentication requests.

Limitations of Auth2:

Vulnerable to attacks: Auth2, like every protocol, is vulnerable to attacks if not implemented appropriately.
Limited control over user data: Clients have limited control over user data obtained through Auth2.
Complexity for certain scenarios: Certain use cases may necessitate further configuration or customisation.

We use various preventions to avoid Vulnerability assaults but that is quite long to mention here, I can write a whole blog on that if needed let me know.


Auth2 has evolved as the main online authorization standard, providing a combination of security, convenience, and flexibility. Its extensive use and simplicity of integration make it an invaluable tool for both developers and users. However, it is critical to understand its limits and put suitable security measures in place to prevent such risks.

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