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It was tested with a weaker device – the Raspberry Pi 3 – in which the results can be seen more clearly.
UaExpert was used as the OPC UA client.
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Depending on the length of the key, the following times may result when establishing communication:
| Variable count / Key length | unencrypted | 2048 | 3072 | 4096 |
|---|---|---|---|---|
| 1000 variables | ~ 1 Sek. | ~ 6 Sek. | ~ 16 Sek. | ~ 25 Sek. |
| 2000 variables | ~ 2 Sek. | ~ 8 Sek | ~ 18 Sek. | ~ 26 Sek. |
| Note |
|---|
Depending on the client, it may not be possible to establish a connection to the controller. |
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Even during normal operation, the encryption requires a little more computing power, as the following table shows:
| Variable count / Key length | unencrypted | 2048 | 3072 | 4096 |
|---|---|---|---|---|
| 1000 variables | ~ 23 % | ~25 % | ~ 25 % | ~ 25 % |
| 2000 variables | ~ 35 % | ~ 39 % | ~ 40 % | ~ 40 % |