Computer crime involves the illegal use of computers and networks, such as gaining unauthorized access, using technology for criminal purposes, or engaging in activities like hacking, cracking, embezzlement, or theft of information. Common computer crimes include using "bombs" to cause system damage at a set time, "piggybacking" by riding into a system on an authorized user's access, the "salami technique" of funneling small stolen amounts from many sources, "scavenging" by searching trash for sensitive information, and "zapping" security systems with bypass software.