OAuth2 Interview Questions (2023) | CodeUsingJava

OAuth2 Interview Questions

In this post we will look at OAuth2 Interview questions. Examples are provided with explanation.
  1. What is OAuth?
  2. What type of accounts can use Oauth 2.0?
  3. How Does Oauth 2.0 Work?
  4. How is OAuth 2 different from OAuth 1?
  5. How do i add a device to my receiver?
  6. What is an AAP (application Authentication Package)?
  7. What are the different types Of Aaps?
  8. What are Bearer Tokens and token_type in OAuth 2?

What is OAuth?

OAuth 2.0 is the industry-standard protocol for authorization. OAuth 2.0 focuses on client developer simplicity while providing specific authorization flows for web applications, desktop applications, mobile phones, and living room devices. It is an open authorization protocol, which allows accessing the resources of the resource owner by enabling the client applications on HTTP services such as Facebook, GitHub, etc.
OAuth 2.0 works by delegating user authentication to the service that hosts the user account, and authorizing third-party applications to access the user account. OAuth 2 provides authorization flows for web and desktop applications, and mobile devices.

What type of accounts can use Oauth 2.0?

OAuth 2.0 is used by all accounts both paid and non-paid G Suite accounts.
For user authentication, BitTitan uses OAuth 2.0 WebApplication workflow.
For administrative authentication, BitTitan uses OAuth 2.0 ServiceAccount workflow.

How Does Oauth 2.0 Work?

OAuth doesn't share password data but instead uses authorization tokens to prove an identity between consumers and service providers. It is an authentication protocol that allows you to approve one application interacting with another on your behalf without giving away your password
To access protected data stored on Google services, use OAuth 2.0 for authorization. The access token is also associated with a limited scope that defines the kind of data the client application has access to. An important goal for OAuth 2.0 is to provide secure and convenient access to the protected data, while minimizing the potential impact if an access token is stolen.


How is OAuth 2 different from OAuth 1?

OAuth 1.0
  • Security is not delegated to HTTPS/TLS.
  • Digital signatures are used to prove the integrity and authenticity of a message. Digital signatures can ensure that a certain message was sent from a specific source and that the message and signature were not tampered with in any way. A signed message is tied to its origin. It cannot be tampered with or copied to another source, but client-side implementations can be especially complex.
  • If a single message within the communication is constructed or signed improperly, the entire transaction will be invalidated.
  • Basic signature workflow.
OAuth 2.0
  • Most security defenses are delegated to HTTPS/TLS. A typo, an improper TLS configuration, a failure to properly validate a certificate, or vulnerabilities in an underlying library can lead to a man-in-the-middle (MitM) attack, compromising all OAuth communications.
  • These are easy for integration but not great for security. Bearer tokens do not provide internal security mechanisms. They can be copied or stolen but are easier to implement.
  • OAuth 2.0 is much more usable, but much more difficult to build securely.
  • OAuth 1.0 only handled web workflows, but OAuth 2.0 considers non-web clients as well.
  • Handling resource requests and handling user authorization can be decoupled in OAuth 2.0.
  • Basic signature workflow.

How do i add a device to my receiver?

Select the receiver name, on your device.
Tune to channel 9301 on that receiver.
Arrow over to Add a Device.
Enter the 4 digit code on the TV into the device and select Done.

What is an AAP (application Authentication Package)?

AppAuth is a client SDK for native apps to authenticate and authorize end-users using OAuth 2.0 and OpenID Connect.The AAPbundle is a zip file that contains resource files including your Application Certificate and your Developer Key. The resource files differ depending on whether your app is certified for a development environment or a production environment.

What are the different types Of Aaps?

There are two different types of AAP:
  • Production: This AAP will be issued after your app completes AT&T Quality Engineering testing. The AAP bundle will contain the environment name prodca.
  • ZDEV: This is a test environment that can be used to test your application. This environment can be accessed through the developer channel. If you have a consumer U-verse account, you can apply for this channel to be enabled on your U-verse receiver through the Launch Center.


What are Bearer Tokens and Authentication?

Bearer Tokens are the predominant type of access token used with OAuth 2.0. A Bearer Token is an opaque string, not intended to have any meaning to clients using it. Some servers will issue tokens that are a short string of hexadecimal characters, while others may use structured tokens such as JSON Web Tokens.
Bearer authentication also called token authentication is an HTTP authentication scheme that involves security tokens called bearer tokens.The bearer token is a cryptic string, usually generated by the server in response to a login request.