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JSON Web Tokens (JWTs)

Information Technology > Web security

Description

JSON Web Tokens (JWTs) are a compact, URL-safe means of representing claims to be transferred between two parties. They're used in authentication and information exchange, where they can confirm the identity of users and transmit data. A JWT consists of three parts: a header, a payload, and a signature. The header identifies which algorithm is used to generate the signature. The payload contains the actual information (claims), while the signature verifies that the sender is who they say they are. Understanding JWTs involves knowing how to create, sign, decode, and verify them, as well as implementing them securely in applications.

Expected Behaviors

✎
LEVEL 1

Fundamental Awareness

At this level, individuals are expected to have a basic understanding of what JWTs are and their typical use cases. They should be able to recognize the structure of a JWT and understand its components. However, they may not yet be comfortable with creating or manipulating JWTs themselves.

🌱
LEVEL 2

Novice

Novices should be capable of creating and signing JWTs, as well as verifying their signatures and decoding their payloads. They should also understand the difference between public and private keys in JWTs. At this stage, they may still need guidance when implementing JWTs in real-world applications.

🌍
LEVEL 3

Intermediate

Intermediate users should be comfortable implementing JWT authentication in an application, handling JWT expiration and renewal, and using JWTs with cookies for session management. They should also have a good understanding of how to secure JWTs and mitigate potential security risks.

⭐
LEVEL 4

Advanced

Advanced users are expected to handle more complex tasks such as implementing JWT blacklisting, using JWTs with OAuth2.0, and implementing multi-factor authentication with JWTs. They should also be aware of common JWT security risks and know how to mitigate them.

🏆
LEVEL 5

Expert

Experts should be capable of designing and implementing a scalable JWT infrastructure, performing advanced JWT debugging and troubleshooting, and applying advanced JWT security practices. They should also be able to customize JWT encoding and decoding processes to suit specific needs.

Micro Skills

✎
LEVEL 1

Fundamental Awareness

Knowing the definition of JWT
Recognizing the purpose of JWTs
Identifying the components of a JWT
Understanding the header, payload, and signature sections of a JWT
Recognizing the format of a JWT
Identifying common claims in a JWT payload
Identifying when to use JWTs for authentication
Recognizing when to use JWTs for information exchange
Understanding the benefits of using JWTs over traditional session cookies
🌱
LEVEL 2

Novice

Understanding the components of a JWT (header, payload, signature)
Choosing an appropriate signing algorithm
Generating a secret or key pair for signing
Using a JWT library to create and sign a token
Understanding how JWT signatures work
Using a JWT library to verify a token's signature
Handling cases where the signature verification fails
Understanding how JWT payloads are encoded
Using a JWT library to decode a token's payload
Handling cases where the payload decoding fails
Knowing what public and private keys are
Understanding how they are used in asymmetric JWT signing
Recognizing when to use symmetric vs asymmetric signing
🌍
LEVEL 3

Intermediate

Choosing a suitable JWT library for your programming language
Generating JWTs upon successful user authentication
Sending JWTs to the client side
Using JWTs for subsequent authenticated requests
Setting an expiration time for JWTs
Creating a process for refreshing expired JWTs
Handling JWT expiration on the client side
Handling JWT expiration on the server side
Storing JWTs in HTTP-only cookies
Sending JWTs via cookies in authenticated requests
Clearing JWT cookies upon logout
Handling CSRF protection when using JWTs with cookies
Knowing the importance of using HTTPS with JWTs
Understanding the risks of storing JWTs in local storage
Implementing measures to prevent JWT theft
Understanding the implications of JWT data being base64 encoded but not encrypted
⭐
LEVEL 4

Advanced

Understanding the need for JWT blacklisting
Creating a blacklist database or cache
Adding tokens to the blacklist upon certain events
Checking incoming tokens against the blacklist
Understanding the OAuth2.0 protocol
Knowing how JWTs fit into the OAuth2.0 flow
Implementing an OAuth2.0 authorization server that issues JWTs
Validating JWTs in an OAuth2.0 resource server
Identifying common JWT security risks
Implementing measures to prevent token theft
Securing the JWT signature
Preventing replay attacks
Understanding the concept of multi-factor authentication
Designing a JWT-based multi-factor authentication flow
Implementing a secondary authentication factor
Issuing and validating JWTs in a multi-factor authentication context
🏆
LEVEL 5

Expert

Understanding the requirements for scalability in JWT infrastructure
Designing a JWT infrastructure that can handle high traffic
Implementing load balancing in JWT infrastructure
Optimizing JWT infrastructure for performance
Identifying common JWT errors
Using debugging tools for JWT
Troubleshooting JWT signature issues
Resolving JWT expiration related problems
Implementing JWT encryption
Mitigating JWT replay attacks
Securing JWT at rest and in transit
Applying best practices for JWT secret key management
Understanding the JWT encoding process
Modifying the default JWT encoding process
Understanding the JWT decoding process
Modifying the default JWT decoding process

Skill Overview

  • Expert2 years experience
  • Micro-skills70
  • Roles requiring skill3

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