Making a Subset difference: The Crypto in AACS presented at BSidesManchester 2019

by Rael Sasiak-rushby,

Summary : When I wanted to understand how AACS works I found very little information/explanation. The Subset-Difference tree and how it provides efficient revocation in a broadcast encryption scenario was particularly opaque.This talk aims to demystify the crypto in AACS, explaining how we can revoke a device's ability to decode media without relying on co-operation from the device.