Software engineer on the first 64 bits Unix (Cray).
System & network admin., security architect of a network 3000 @MAC wide.
30 years experience on top of Unix (-es + 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 criminals to notice it. - A highly priviledged account protected with a basic password (123456) so as to avoid rising attention of cyber-criminals. - Witnesses names hidden by a black box in a public PDF document so as to avoid exposing publicly their names. - Random number generator with a secret key switching it in debugging mode where it is not anymore random. - Windows bugs kept secret for years so as to avoid criminals to take advantage of them.