With the development of this article, we want to present the information in a more detailed and concise way on the subject of computer security and the auditorias in such a way, it is easy to enter into any public that stumbles upon our article. For its development, a compilation of information was made from different articles, books, and research on the subject of computer security and auditing. A proposal was made of what are the phases or the essential procedure to carry out an audit in a correct way that will help the people who are starting with the audits.