Certificates and keys in OPC UA
To identify the participants in a communication and to guarantee the authenticity and confidentiality of the exchanged messages, every OPC UA application (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
- Used to sign messages to send and to decrypt the messages received.
- Public key file
- Used to verify the signature of the messages received and to encrypt the messages to send.
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