Secure access to field instruments is of the highest priority for operators across all branches of the process industry. Modern plants contain hundreds or thousands of measurement and control instruments that must be accessed remotely with growing frequency. These field instruments also have to be installed, monitored or serviced on a regular basis. Secure password-based user authentication plays a special role today, especially when devices with digital interfaces are involved.
Security with user-friendly password lengths
In order to utilise Bluetooth communications technology in industrial environments, security experts at Endress+Hauser identified a need for additional protection. The result was the development of a solution called CPace, which belongs to the class of PAKE (password-authenticated key exchange) methods. Among other things, PAKE technology is used with the German electronic ID cards as a means of largely decoupling the cryptographic security level from the length of the password. The advantage of CPace is that the processing power of even the smallest of field instruments is sufficient to provide devices, and thus the industrial systems, with the best level of protection against cyberattacks. At the same time, CPace enjoys a high degree of acceptance among users given that the desired level of security can be achieved without relying on long passwords.
“We had to look internally to find a solution for establishing secure connections to the instruments,” explains Dr Björn Haase, project head at Endress+Hauser. “Previously available secure methods could not be used because of the limited processing power and storage capacity of field instruments. Password verification would have meant a login delay of two minutes or more.”
CPace makes life difficult for hackers
The security of the PAKE-based solution with Bluetooth technology from Endress+Hauser was previously verified in 2016 as part of an analysis by the Fraunhofer Institute for Applied and Integrated Security. The institute classified the protection level of the Endress+Hauser security layer, the core component of which is recommended for use in Internet environments, as high.
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