How to solve it

Erin Browning

Slides will be available on Twitter @efrowning


Erin Browning

Senior Security Engineer

a.k.a., I'm a hacker

You can contact me at:


The cryptoscarf started when I met @fbz at Blackhoodie in April of this year.
What kind of crypto can I do that'll fit in a scarf?
Idea 1: knits + purls for each bit
Idea 2: colored blobs
Idea 3: QR codes?
How much data can I fit in a scannable, knitted QR code?
Decided on RC4 for the cryptography:
  • Short messages are vulnerable to repeated key attacks
  • Famous for WEP and TLS vulnerabilities
First of all, can you even XOR?

see you on the internet