Dahua NVR21-4KS3 Series User Manual page 418

Figure 5-290 Audio and video transmission
Step 2 Configure parameters.
Table 5-82 Audio and video transmission parameters
Area Parameter
Enable
Private
Encryption
Protocol
Type
Update Period
of Secret Key
Enable
RTSP over
TLS
Select a device
certificate
Certificate
Management
Step 3 Click Apply.
Description
Enables stream frame encryption by using private protocol.
There might be safety risk if this service is disabled.
Use the default setting.
Secret key update period.
Value range: 0–720 hours. 0 means never update the secret
key.
Default value: 12.
Enables RTSP stream encryption by using TLS.
There might be safety risk if this service is disabled.
Select a device certificate for RTSP over TLS.
For details about certificate management, see "5.14.4.1 Device
Certificate".
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