Security hacker another crime such as destroying information contained in that system". These subgroups may also be defined by the legal status of their activities. A white hat hacker breaks security for non-malicious reasons, either to test their own security system, perform penetration tests, or vulnerability assessments for a client - or while working for a security company which makes security software. The term is generally synonymous with ethical hacker, and the EC-Council, among others, have developed certifications, courseware, classes, and online training covering the diverse arena of ethical hacking. A "black hat" hacker is a hacker who "violates computer security for
IPv6-to-IPv6 Network Prefix Translation IPv6-to-IPv6 Network Prefix Translation IPv6-to-IPv6 Network Prefix Translation (NPTv6) is an experimental specification for IPv6 to achieve the address-independence at the network edge, given by network address translation (NAT) in Internet Protocol version 4. It has fewer architectural problems than traditional IPv4 NAT; it is for example stateless and preserves the reachability attributed to the end-to-end principle. However, the method still lacks solutions to translate embedding IPv6 addresses, for example in IPsec, and requires a more complex DNS setup (split-horizon DNS). One use case for IPv6-IPv6 Network Prefix Translation is multihoming for small networks; this may also be implemented with