The secret code used in the public transport smart card (OV-chipkaart) due to replace strip tickets next year in Amsterdam and throughout the Netherlands has been cracked by two German computer hackers. The announcement, made by the hackers at the 24th Chaos Computer Congress in Berlin late last year, has put the introduction of the new system in doubt as consumer groups claim that passenger details would no longer be safe. Following the revelations Translink Systems, the company developing the transport card, have engaged the TNO research institute to investigate system security.

Trial runs of the OV-chipkaart have already been carried out in in Rotterdam with mixed results.