Three New Attacks Against JSON Web Tokens

Three New Attacks Against JSON Web Tokens

Tom Tervoort

#BHUSA @BlackHatEvents

Speaker intro

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Outline

1. Background

- Transferring identity claims - JSON Web Tokens - Prior attacks - Criticisms

2. New attacks

- Sign/encrypt confusion - Polyglot token - Billion hash attack

3. Takeaways

#BHUSA @BlackHatEvents

Background

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Transferring identity claims

Classic (stateful) approach

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