How to enable message encryption in Contiki / Cooja simulator?

Question

I want to encrypt the messages that are exchanged between sensor nodes.

Can I do it without having access to real hardware sensor nodes, such as Tmote Sky?

Can s

Answer 1

The llsec is the security stack. For example the anti-replay llsec_driver avoid replay attack.
About pure encryption (so no logic security), software encryption are available for all platform (not only skymote) with hardware boost (for some platform) (contiki-os blog check at encryption paragraph).
Cooja is an emulator, not a simulator (Cooja in depth). So it simulates everything from the hardware. Therefore, you don't need a real mote to make test.
Symmetric and asymmetric encryption have differences on a logical point of view. But on hardware it's same : you'll send bits that represent a key. I don't see why it would be different for emulation.
For hardware encryption, if the mote support it, yes you can. If not you can't. (emulated or not).
Hope it helped.