Siemens SIMATIC ET 200AL System Manual page 1297

Distributed i/o system

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OPC UA communication

9.2 Security at OPC UA

Secure channel

OPC UA uses the private and public key of client and server to establish a secure connection,

the secure channel. Once the secure connection has been established, the client and server

generate an internal key only known to them which they both use for signing and encrypting

messages. This symmetric process (a shared key) is much faster than asymmetric processes

(private and public key).

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