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OPC-10000-4 – OPC Unified Architecture - Part 4: Services6.1.4 Creating a SecureChannelhave access to Certificates that can be used to encrypt and sign Messages exchange. The ApplicationInstanceCertificates installed by following the process described in 6.1.2 may be used for this purpose ... many cases, the Certificates used to establish the SecureChannel will be the ApplicationInstanceCertificates . However, some Communication Stacks might not support Certificates that are specific to a single application. Instead, they