Cryptographer. Co-author of OpenPGP, DKIM, syslog-sign, ZRTP, the Skein hash function, Threefish cipher, and other things.
Businessman. Co-founder of PGP Corporation, Silent Circle, World Benders, and others. Presently CTO at Entrust.
Software engineer. Worked at the above as well as Apple, DEC, NASA, and others.
Q&A for software developers, mathematicians and others interested in cryptography