In a past life, I was a software engineer, cryptographer, and computer security person.

Here are some of the things I have done.

• Multiple implementations of elliptic curve cryptography code (cellphones, Bluetooth, hardware security modules)
• Reviewed security of code, especially primary boot loader in cell phones
• Implemented random number generators (cell phones, hardware security modules)
• Analyzed quality of the entropy sources for RNGs.
• High speed system area networking research