A system and method for authenticating the source and ensuring the integrity of traffic data collected from probe vehicles while maintaining the privacy of the data's source. This is accomplished by dividing the traffic analysis functionality into two distinct responsibilities: data collection, including authentication and verification, and data processing, and assigning each responsibility to a different entity, such the first entity has access to authentication information which identifies the data's source but not to traffic information such as the source's location, and the second entity has access to the traffic information but not to the authentication information which identifies the data's source.