This message was posted on behalf of Intel Corporation
I will be more than glad to assist you with your concern.
Based on the information provided I will continue with the investigation of your concern.
As soon as I have further details I will let you know.
I would recommend that you post the same question to the Intel Developer Zone Forum: https://software.intel.com/en-us/forum
The Intel® Core™ i5-6600K Processor (6M Cache, up to 3.90 GHz) Specifications does feature Intel® AES New Instructions but it also has to be supported by the BIOS and by the Operating System (I am not aware if Linux requires additional libraries to fully support it, see the following article: https://www.cyberciti.biz/faq/how-to-find-out-aes-ni-advanced-encryption-enabled-on-linux-system/)
I hope this helps,