Verification of service access in a communications system

A host server for verifying a log entry in a communications system, the host server comprising:

• processing circuitry;
• and
• a computer program product storing instructions that, when executed by the processing circuitry, causes the host server to:
• obtain a log entry of a service access tracker, the log entry indicating access to a service during a client session, the service being tracked by the service access tracker;
• provide the log entry to a trusted third party for digital signing thereof using a digital trusted timestamping scheme;
• verify that the log entry has been digitally signed by the trusted third party;
• provide a new aggregate comprising the digitally signed log entry and a previous aggregate of previously digitally signed and aggregated log entries to the trusted third party for digital signing thereof using the digital trusted timestamping scheme;
• and
• verify that the new aggregate has been digitally signed by the trusted third party.

A computer program for verifying a log entry in a communications system, the computer program comprising computer code which, when run on processing circuitry of a host server, causes the host server to:

• obtain a log entry of a service access tracker, the log entry indicating access to a service during a client session, the service being tracked by the service access tracker;
• provide the log entry to a trusted third party for digital signing thereof using a digital trusted timestamping scheme;
• verify that the log entry has been digitally signed by the trusted third party;
• provide a new aggregate comprising the digitally signed log entry and a previous aggregate of previously digitally signed and aggregated log entries to the trusted third party for digital signing thereof using the digital trusted timestamping scheme;
• and
• verify that the new aggregate has been digitally signed by the trusted third party.