Provision of security for e-Commerce transactions based on digital certificates that can be checked for validity using local status databases that are updated from a central database

摘要

System for requesting the status of digital certificates based on a central database (4). In addition to the central database there are a large number of local certificate status databases (12) that can be accessed by external users. Each local database contains only a part of the total data quantity and a replication unit (6, 8, 10) is used to compare the data content of local and central databases.