Methods, systems and computer program products for checking the validity of data

摘要

Techniques are provided which can prevent secret data or falsified data in a data providing system (102) from being presented to a data requesting system (100). A data verifying system (101) is installed in a network interconnecting the data requesting system and data providing system. The data verifying system checks whether verification data for supplied data matches the supplied data. In accordance with this check, data to be transmitted from the data verifying system to the data requesting system is altered.