2600: The Hacker Quarterly is an American magazine specializing in the publication of technical information about computer and telephone networks, PBXs, network protocols and services, as well as news of the "computer underground" and articles of an anarchist persuasion. The name of the journal comes from the frequency of the signal 2600 Hz, which was used in telephone networks and, in case of incorrect use, opened up additional opportunities for the user (for example, free long-distance...