Softing smartLink HW-DP User Manual page 55

4.1.7.3
Security
Select OPC UA
UA server) and the OPC UA client application.
In the Security Configuration window frame, smartLink HW-DP offers three encryption modes
supported by three security policies for secure OPC UA communication:
If you have changed any of the security configuration setting, a pencil icon
the settings have been changed but have not yet been applied and the changes still need to be
executed by clicking [Apply] in the top right corner.
Message Security
Modes
None
Sign
Sign and Encrypt
Version EN-012025-1.32
à
Security to configure a secure communication between the smartLink HW-DP (OPC
Meaning
Don't use any encryption. No certificate exchange is needed between smartLink HW-DP
and a client. Be aware that communication on the network is readable by others. This
might be a security risk.
Messages sent from smartLink HW-DP or the OPC UA client are signed with the private
key of the sender. The receiving entity can validate the origin of the message using the
public key of the sending entity. Nevertheless, messages are not encrypted.
Message are signed as in the Sign mode and additionally encrypted with the public key of
the receiving entity. On the receiver side the message can be decrypted using its private
key.
Chapter 4 - Working with smartLink HW-DP
is shown to indicate that
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