Software engineer on the first 64 bits Unix (Cray).
System & network admin. on top of a > 1000 Mac.
30 years experience on top of Unix (and internals).
Chief Information Security Officer.
Security through obscurity: - A transparent bottle of sulfuric acid with no label on it so as to prevent it to be stolen by terrorists. - A backup disk of confidential information with no label on it so as to avoid intelligence agencies and industrial spy to notice it. - A highly priviledged account protected with a basic password (123456) so as to avoid it rising attention of cyber-criminals. - Witnesses names hidden by a black box in a public PDF document so as to avoid their life to be at risk. - Random number generator with a secret key switching it in debugging mode where decoding every traffic is achieved with instantly. - Windows bugs kept secret for years so as to avoid cyber-criminal to use them.