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Many OT systems cannot be patched because they are too old, or an update could affect operations. Older production machines do not have integrated security, therefore common measures such as strong authentication and encryption are not implemented and cannot be retrofitted.
Ultimately, you need a security system that is specifically designed for OT environments, but also utilizes leading technologies from IT security.
Learn about a security system that can understand special OT protocols and cope with harsh environmental conditions without disrupting production.