The federal computer fraud and abuse statute, 18 U. S. C. 1030, protects federal computers, bank computers, and computers used in interstate and foreign commerce. It shields them from trespassing, threats, damage, espionage, and from being corruptly used as instruments of fraud. It is not a comprehensive provision, but instead it fills crack and gaps in the protection afforded by other federal criminal laws. This is a brief sketch of section 1030 and some of its federal statutory companions.