Certificates and keys in OPC UA
To identify the participants in a communication and to verify the authenticity and confidentiality of the exchanged messages, every OPC UA application, including client and server, must have a public certificate that is an Application Instance Interface and a public key/private key pair.
Keys
The public key is distributed with the certificate. The private key is not disclosed.
- Private key file. Signs messages to send and decrypts received messages.
- Public key file. Verifies signatures of the received messages and encrypts sent messages.
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