In part one of this article, we discussed how manual and automatic file deletion activities may leave data remnants on disk, which could compromise sensitive information. By understanding where these remnants hide, we are able to devise methods for preventing data leakage and permanently removing traces of old files. This is critical if an attacker could gain physical access to the system or if the storage medium is to be discarded, sold, or reused.

On corporate networks, employee Internet abuse is responsible for massive losses in productivity and is one of the leading threats to enterprise security. Home networks are not immune to the hazards of an open network. Children may introduce malware through P2P applications, gain access to inappropriate content, and possibly expose their parents to legal liability.