19
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4.6.2 Digital signature
The pane is used for log file integrity control.
The digital signature is intended to check the integrity of the log file after removing the memory card
from the data logger or copying files to PC.
Use the parameter
Digital signature
to enable / disable the digital signature.
To create a digital key, proceed as follows:
Fig. 4.9
Generated key
1. Set
Digital signature
to
ON
to enable the feature.
2. Click
Generate
to generate a key.
3. Click
Save to MSD200
to save the generated key in the
device (saving takes 20...60 seconds).
4. Click
Save to file
to save the key to a file on PC.
5. Click
Apply
to initialize the key.
Manually specified key
1. Select
ON
to enable the feature
2. Enter the desired key (1…16 characters) into the fields
Key
and
Confirm key
.
3. Click
Save to MSD200
to save the generated key in the device (saving takes 20...60 seconds).
4. Click
Save to file
to save the key to a file on PC, or just write it down.
5. Click
Apply
to initialize the key.
The key cannot be read from the device memory.
The digital signature is formed in the log file on the memory card (
). This occurs when the
data from the RAM buffer are transferred to the memory card and takes up to 60 seconds when the
device is on.
4.6.2.1 Check log file integrity
The log file created on the memory card is protected by a digital signature. To check the integrity of a
copy of the log file on your PC, proceed as follows:
1. Establish connection between the logger and the program.
2. Open File Manager tab.
3. Click
Refresh
to update the file trees on both panes.
4. Select the file on the memory card (right pane).
5. Select the target folder on the PC (left pane) to which the file will be copied, and click
Copy
.
6. Select the copied file and click
Check signature
.
7. In the open dialog box, enter the key previously saved in MSD200.
Fig. 4.10
Click the ellipsis button
to search for a key file previously saved on the PC, select it and click
OK
.
If it is a manually specified key, you can optionally enter the noticed key into the input field.
The message “
Digital signature matches
” appears if the log file copy has not been changed.
