@inproceedings{hofheinz06attack,
  author       = {Hofheinz, Dennis and Unruh, Dominique},
  title        = {An attack on a group-based cryptographic scheme},
  booktitle    = {Algebraic Methods in Cryptography},
  series       = {Contemporary Mathematics},
  volume       = {418},
  year         = {2006},
  publisher    = {AMS},
  pages        = {133-140}
}