An abstract logo would be fine, must include full text "EsotericSec", no space! No Shields! No Red! Company is defense focused, I'm anticipating a light background. on the website. 

If you can tie these concepts in, great, if not, oh well: 
Eso - Greek for From Within
Esoteric - intended for or likely to be understood by only a small number of people with a specialized knowledge or interest.

Planning on helping orgs fix themselves by understanding what they got and how they use it. Focus on what really keeps them running.