1. Advanced Safety Vehicle Program, http://www.ahsra.or.jp/demo2000/eng/demo_e/ahs_e7/iguchi/iguchi.html
2. Beresford, A.R., Stajano, F.: Location privacy in pervasive computing. IEEE Pervasive Computing 3(1), 46–55 (2003)
3. Beresford, A., Stajano, F.: Mix Zones: User privacy in location-aware services. In: Proceedings of First IEEE International Workshop on Pervasive Computing and Communication Security (PerSec) 2004, a workshop in PerCom (2004)
4. Communications for eSafety, http://www.comesafety.org/
5. Chaum, D.: The Dining Cryptographers Problem: Unconditional sender and recipient untraceability. Journal of Cryptology 1(1), 65–75 (1988)