System and method for traffic volume publication applying differential privacy

A system for traffic volume publication in a road traffic network, the system comprising:

• a window size calculation module that calculates the transition probability for each of a plurality of road segments at a first timestamp, based on traffic information including information on the road segments and original traffic volume data for the road segments, and that compares entropy for the calculated transition probability to a preset threshold and calculates a first window size for each road segment for the first timestamp by using the preset threshold or the entropy calculated based on the probability values of past trajectories prior to the first timestamp;
• a window size prediction module that predicts a second window size for a third timestamp subsequent to the first timestamp, either based on the first window size calculated at the first timestamp or based on the first window size and a window size calculated in advance at a second timestamp prior to the first timestamp;
• and
• a traffic volume publication module that publishes noisy traffic volume data by calculating the amount of noise to be inserted into the original traffic volume data at the first timestamp by using the calculated first window size and the predicted second window size.