The problem is that I cannot find out, how to interface it with Arduino.../
Not very feasible on a Nano - not so long ago I looked into this, and it was mentioned that the encryption code takes almost 30 kB of Flash, leaving almost nothing left for your sketch.
Do Arduino nano support encryption/decryption, does anyone have experience with this?
That depends on what sort of encryption you want. Do you want to confuse me, or the CIA?...R
but either someone with bruteforce attack to invade my sensors network.
The only thing I can say, is that in the future the major problem in IoT will be such kind of attacks.
Haven't had time to play with them yet but I have a pair of DT-06 modules. These are based on the ESP-8285 and look to offer transparent wifi communication over regular UART