Authentication:

Authentication is the process of verifying that a user is who they claim to be. It is the first line of defence against unauthorized methods of authentication, including basic authentication, OAuth2.0, JSON Web Token(JWTS), and OpenID Connect.

1. Basic Authentication:

Basic Authentication is the simplest form of authentication, Where a user is authenticated by sending their username and password with every request. This method is not very secure because the username and password are sent in plain text, Which can be intercepted by attackers. Therefore, basic authentication should only be used if HTTPS is enabled.

2.OAuth 2.0:

OAuth 2.0 is an industry-standard protocol for authorization. It allows users to grant access to their resources to third-party applications without revealing their passwords. OAuth 2.0 works by creating an access token that is obtained by exchanging a set of credentials, such as a username and password, for an access token. OAuth 2.0 is widely used by social media sites such as Facebook, Twitter, and LinkedIn.

3.JSON Web Tokens(JWTs):

JSON Web Tokens (JWTs) are a compact, URL-safe means of representing claims to be transferred between two parties. JWTs can be used for authentication and authorization purposes. JWTs are self-contained, which means they contain all the necessary information to validate a user's identity. JWTs can be signed with a secret key, which ensures that the token is not tempered.

4. OpenID Connect:

OpenID Connect is a simple identity layer on top of OAuth 2.0. It provides authentication and authorization capabilities for web and mobile applications.OpenID Connect provides a standard way of exchanging identity information between parties. It is widely used by identity providers such as Google, Microsoft, and Amazon.

Authorization

Authorization is the process of determining what resources a user can access. Authorization ensures that users only have access to the resources they are authorised, including role-based access control (RBAC), attribute-based access control(ABAC), and policy-based access control.

1.Role-Based Access Control(RBAC):

Role-Based Access Control (RBAC) is a method of authorization where access is granted based on the user's role or job function. RBAC is based on the principle of least privilege, where users are granted only the minimum privileges required to perform their job function. RBAC is widely used by organizations to manage access to resources.

2.Attribute-Based Access Control(ABAC):

Attribute-based Access control (ABAC) is a method of authorization where access is granted based on attributes or characteristics of the user, such as their department, location, or job title, ABAC is more flexible than RBAC because it allows access to be granted based on multiple attributes.

3.Policy-Based Access Control:

Policy-Based Access Control is a method of authorization where access is granted based on policies that are defined by the organization. Policies are rules that specify which conditions. Policy-Based Access Control is more flexible than RBAC and ABAC because it allows access to be granted based on complex rules.