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Technical experts skilled, often young, computer programmers, who almost whimsically probe the defenses of a computer system, searching out the limits and the possibilities of the machine. The New York Times, reporting on the incident in 1981, describes hackers as


This was an early example of a kind of sportive, but very effective, debugging that was often repeated in the evolution of APL systems. In their documentation they acknowledge their gratitude to "a number of high school students for their compulsion to bomb the system".
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They modeled their system after APL/360, which had by that time been developed and seen substantial use inside of IBM, using code borrowed from MAT/1500 where possible.
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Science Research Associates undertook to write a full APL system for the IBM 1500. This first informal network penetration effort was later acknowledged as helping harden the security of one of the first publicly accessible networks: Eventually, curiosity drove the students to explore the system's wider context.
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They were free to explore the system, often using existing code available in public Workspaces as models for their own creations. Working independently, the students quickly learned the language and the system. The APL network system was structured in Workspaces which were assigned to various clients using the system. In the Fall of 1967, IBM (through Science Research Associates) approached Evanston Township High School with the offer of four 2741 Selectric teletypewriter based terminals with dial-up modem connectivity to an experimental computer system which implemented an early version of the APL programming language. The first known incidence of network penetration hacking took place when members of a computer club at a suburban Chicago area high school were provided access to IBM's APL network.
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The flaw was discovered when two system programmers were editing at the same time and the temporary files for the message-of-the day and the password file became swapped, causing the contents of the system CTSS password file to display to any user logging into the system.

The standard text editor on the system was designed to be used by one user at a time, working in one directory, and so created a temporary file with a constant name for all instantiations of the editor. Mathews from MIT found a vulnerability in a CTSS running on an IBM 7094.

Eccles requests that anyone working or hacking on the electrical system turn the power off to avoid fuse blowing." The minutes of an April 1955 meeting of the Tech Model Railroad Club state that "Mr.
