147/5000 The basic meaning of a hacker is a person with a skilled computer technology, but most of the media is used to refer to "hackers" as computer intruders. White hat hackers have the ability to disrupt computer security without malicious intent. White hats generally have clear definitions of ethics and often try to work with companies to improve identified vulnerabilities. Grey hat hackers for ethical and legal ambiguity. Black hat hackers: black hat hackers - often used to distinguish between black hat hackers and generally (positive) hackers who are rational. The term has been popular since 1983, presumably due to the use of similar pronunciation and the explanation of safe cracker, and it has been translated into a mixture of crime and hacker. Computer security hacks - using password cracking or brute force attack. Software decoder script child (activist hacker) After world war ii, with the recovery and prosperity of the world economy and the rapid growth of the population, the world appeared to be internationally popular tourism. The progress of science and technology has greatly improved the traffic conditions. Create conditions for travel; The improvement of labor productivity, people disposable income increase, to travel and enjoy the hotel's service record for expanded rapidly, speed up the popularization and the world of tourism activities in political, economic and cultural exchanges and frequent. This change in social needs pushed the restaurant industry into the modern hotel period.