  Anshel, Anshel, Goldfeld and Lemieaux introduced the Colored Burau Key
Agreement Protocol (CBKAP) as the concrete instantiation of their Algebraic
Eraser scheme. This scheme, based on techniques from permutation groups, matrix
groups and braid groups, is designed for lightweight environments such as RFID
tags and other IoT applications. It is proposed as an underlying technology for
ISO/IEC 29167-20. SecureRF, the company owning the trademark Algebraic Eraser,
has presented the scheme to the IRTF with a view towards standardisation.
  We present a novel cryptanalysis of this scheme. For parameter sizes
corresponding to claimed 128-bit security, our implementation recovers the
shared key using less than 8 CPU hours, and less than 64MB of memory.
