Design a logo for the project

[kbeyls]

The llsoftsecbook could use a logo to use in a number of different places, such as:

• having a logo for the github repo (or at least the llsoftsec organization on github).
• having a logo on the https://llsoftsec.github.io/llsoftsecbook/ (assuming it's possible to have custom logo on a github.io page)
• having a logo somewhere on the cover of the book.

I'm thinking that the logo should somehow suggest topics such as "low-level code/binary", "security" and "compilers".
A very simple logo could be e.g. some binary code (literally some ones and zeros) on a padlock ("security/hardening"). That wouldn't have "compilers" in it.
It seems the default image referring to compilers has been a dragon somehow. Not sure if other images also make people think of a dragon?