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Information and knowledge has become vital economic resources in this new era. Yet, along with new opportunities, the dependence on information systems brought new threats. Crime remains elusive and ever strives to hide in the face of development, while cyber security is important because government, military, corporate, financial, and medical organizations collect, process, and store unprecedented amounts of data on computers and other devices. Therefore, this paper examines issues on the Information system, ICT, cybercrime, cyber security, cyber ethics and national security in Nigeria. It is a research work carried out by librarians using selected youths in Wuse area of Abuja Municipal Area Council as a case study. The survey research method was used on the population of 150 respondents randomly selected using a convenient sampling method. All the questionnaires were validly filled and returned. The result shows that the main aim of our national security policy is to ensure that our national survival is free from threat and to ensure that our territorial integrity is free from infringement. Majority of the respondents indicated that the methods cyber criminals often used in defrauding its victims are through identity theft and fraud, and also through making direct contact with their victims using emails and phones calls, etc. The rate of cyber-security and adherence to cyber ethics by internet users is low. The paper recommends among others that for the government to combat the menace of cyber crimes, the government should do more in sensitizing the public about cyber-security through its appropriate agencies.