In this paper I am going to give a brief outline of authorship attribution: definitions, usage, short history, available techniques and methods. In Chapter 1 I am presenting the definition and the available methods categorized in three main approaches. In this part I am also presenting the assumptions and expectations that provide a background for authorship attribution. In Chapter 2 I am giving a short history about the methods and techniques from those times when there were no computers available. In Chapters 3 and 4 I am defining the terms (dialect, idiolect, fingerprint and genderlect) that are closely related to authorship attribution. I dedicated a chapter to genderlect as well because I felt that talking about gender differences is an important issue concerning this question as men and women tend to write in different styles so a text can reveal an important constituent of its writer: his/her sex. I found it important to mention some practical fields of application where authorship attribution is used, and that is what Chapter 5 is about. I tried to find famous, interesting, and up-to-date examples that is why I have chosen to write about the Federalist Papers, the Bible, plagiarism and the digital crimes that appear to be a serious problem for the police in our modern world. In Chapter 6 I am listing some linguistic approaches based on Chaski’s report. The rest of the paper (from Chapter 7) is dedicated to some computer-assisted methods that I myself have also tried: I am dealing with vocabulary richness, zipping and measuring word-length.