Cracking JWT tokens (...)
summary
A demonstration shows how a JWT signed with HS256 is brute-forced by a distributed worker pool that maps integer ranges to strings and tries signatures until one verifies. It uses Node.JS, the jsonwebtoken NPM module and ZeroMQ to coordinate server/clients with fixed batch sizes and range cursors; an alphabet of lowercase letters shrinks the space and the demo finds the secret "Milan", resigns a token and gains admin access using the published JWT cracker.
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chapters (10)
- 0:00Introduction
- 1:31What is JWT
- 5:05JWT Structure and Security
- 9:02Session Management and JWT
- 14:25JWT Demonstration
- 17:15Brute Force Strategy
- 20:28Distributed Cracker Design
- 23:55Cracker Architecture
- 27:49Cracking Demo and Results
- 30:59Security Best Practices
