The connection key is derived from the configuration keys and is used for elliptic curve-based encryption. A “per-family” key is shared by all devices from a product line and a “per-model/firmware” key is used to encrypt configurations and maintain code integrity, and a connection key that’s used in the authentication process, as well as to encrypt communications with clients. Siemens PLCs use cryptographic keys for authentication and code protectionĪccording to Claroty, Siemens S7-1200 and S7-1500 PLCs use several keys. “A malicious actor who is able to extract a global, hardcoded key could compromise the entire device product line security in an irreparable way.” ![]() “Since then, however, advances in technology, security research, and a swiftly changing threat landscape have rendered such hardcoded crypto keys an unacceptable risk,” the researchers said in their report. However, the company chose to do so by using a hardcoded global private key for all devices from those product families because back then dynamic key distribution and management was not a common practice and a potential burden for customers. Siemens advises all customers to upgrade both the firmware of the impacted devices as well as the TIA Portal software that engineers use to communicate with them and deploy their programs.Īccording to security researchers from Claroty, Siemens introduced asymmetric cryptography to its SIMATIC S7-1200/1500 PLC CPUs almost a decade ago to protect their configuration, programs, and communications. Have a different setup in mind? No problem – the beauty of master key systems is that they are very flexible and can be set up however you need.Security researchers have found a way to extract a global encryption key that was hardcoded in the CPUs of several Siemens programmable logic controller (PLC) product lines, allowing them to compromise their secure communications and authentication. Many key system sellers (including us) don’t recommend ever cutting these keys. Typically, these keys are owned by an officer of the company and are kept under tight lock and key. If (and that’s a big if) you wanted a key to open all of your stores, you could cut a great grand master key. While your DM had a massive key ring, think about the size of the box it would take to contain keys to all of your stores. ![]() Get excited – it’s time for the granddaddy of them all – the Great Grand Master. ![]() You can give him a Grand Master key that will open every door in all shops in his region. Your District Manager currently carries a key ring the size of a bowling ball and would love to lighten his load. The master key would go to the manager, one sub-master would go to your supervisor, and the other sub-master would go to other employees. You will need a master key system with two sub-masters under it. You want your manager to open all of the doors, your supervisor to open the front door, goods in door, and merchandise case, and you’re other employees to only open the merchandise case. Say your business has four main locks: the front door, goods in door, office door, and merchandise case. Let’s start with a basic system – a Master and Sub-Master. To understand what these levels are, let’s look at an example. You will always have a master and sub-master, but depending on how you want your system set up you may/may not have a grand or great grand master.
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