The session hijacking risk makes it very important for Siemens to assure that the PLC firmware is not configurable to support a particular encryption algorithm. For example, it is not recommended for the integrator to change the encryption algorithm to an AES algorithm that the PLC already supports.
A significant benefit of the original TIA protocol was its simplicity. For example, the TIA standard did not require that the PLC firmware implement the RSA encryption algorithm. Unfortunately, the original TIA protocol also had significant limitations.
However, the original TIA protocol allows for PLC firmware to be configured to support an encryption algorithm other than the one it is running. For example, the firmware could be configured to support an RSA encryption algorithm instead of the default DES algorithm.
By moving its keys and certificates into the PLC, Siemens can be efficient, flexible, and secure in its system design. The Siemens solution creates a secure connection between the PLC and the TIA portal while still providing an easy method for the user to use the device.
While this works fine for a small number of control panel units, as plant sizes increase over time, the number of Siemens controllers and PLCs can exceed the number of available fixed keys. Siemens realized it needed a solution to its expanding network of controller and PLCs and the TIA portal.
Dynamic key management and distribution is based on the industry-leading TrueKey technology, but with a Siemens twist. The TrueKey protocol layer sits between the PLC and the TIA portal. This allows Siemens to distribute and manage keys programmatically. It also provides an opportunity to program the PLC to manage the keys. This is the first time Siemens has implemented this functionality in an industrial control system.
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