The New Hacker Dictionary, an online compendium of software-programmer jargon, officially lists nine different connotations of the word "hack" and a similar number for "hacker." Then again, the same publication also includes an accompanying essay that quotes Phil Agre, an MIT hacker who warns readers not to be fooled by the word's perceived flexibility. "Hack has only one meaning," argues Agre. "An extremely subtle and profound one which defies articulation."
Regardless of the width or narrowness of the definition, most modern hackers trace the word back to MIT, where the term bubbled up as popular item of student jargon in the early 1950s. In 1990 the MIT Museum put together a journal documenting the hacking phenomenon. According to the journal, students who attended the institute during the fifties used the word "hack" the way a modern student might use the word "goof." Hanging a jalopy out a dormitory window was a "hack," but anything harsh or malicious-e.g., egging a rival dorm's windows or defacing a campus statue-fell outside the bounds. Implicit within the definition of "hack" was a spirit of harmless, creative fun.
This spirit would inspire the word's gerund form: "hacking." A 1950s student who spent the better part of the afternoon talking on the phone or dismantling a radio might describe the activity as "hacking." Again, a modern speaker would substitute the verb form of "goof"-"goofing" or "goofing off"-to describe the same activity.
As the 1950s progressed, the word "hack" acquired a sharper, more rebellious edge. The MIT of the 1950s was overly competitive, and hacking emerged as both a reaction to and extension of that competitive culture. Goofs and pranks suddenly became a way to blow off steam, thumb one's nose at campus administration, and indulge creative thinking and behavior stifled by the Institute's rigorous undergraduate curriculum. With its myriad hallways and underground steam tunnels, the Institute offered plenty of exploration opportunities for the student undaunted by locked doors and "No Trespassing" signs. Students began to refer to their off-limits explorations as "tunnel hacking." Above ground, the campus phone system offered similar opportunities. Through casual experimentation and due diligence, students learned how to perform humorous tricks. Drawing inspiration from the more traditional pursuit of tunnel hacking, students quickly dubbed this new activity "phone hacking."
The combined emphasis on creative play and restriction-free exploration would serve as the basis for the future mutations of the hacking term. The first self-described computer hackers of the 1960s MIT campus originated from a late 1950s student group called the Tech Model Railroad Club. A tight clique within the club was the Signals and Power (S&P) Committee-the group behind the railroad club's electrical circuitry system. The system was a sophisticated assortment of relays and switches similar to the kind that controlled the local campus phone system. To control it, a member of the group simply dialed in commands via a connected phone and watched the trains do his bidding.
The nascent electrical engineers responsible for building and maintaining this system saw their activity as similar in spirit to phone hacking. Adopting the hacking term, they began refining it even further. From the S&P hacker point of view, using one less relay to operate a particular stretch of track meant having one more relay for future play. Hacking subtly shifted from a synonym for idle play to a synonym for idle play that improved the overall performance or efficiency of the club's railroad system at the same time. Soon S&P committee members proudly referred to the entire activity of improving and reshaping the track's underlying circuitry as "hacking" and to the people who did it as "hackers."
Given their affinity for sophisticated electronics-not to mention the traditional MIT-student disregard for closed doors and "No Trespassing" signs-it didn't take long before the hackers caught wind of a new machine on campus. Dubbed the TX-0, the machine was one of the first commercially marketed computers. By the end of the 1950s, the entire S&P clique had migrated en masse over to the TX-0 control room, bringing the spirit of creative play with them. The wide-open realm of computer programming would encourage yet another mutation in etymology. "To hack" no longer meant soldering unusual looking circuits, but cobbling together software programs with little regard to "official" methods or software-writing procedures. It also meant improving the efficiency and speed of already-existing programs that tended to hog up machine resources. True to the word's roots, it also meant writing programs that served no other purpose than to amuse or entertain.
A classic example of this expanded hacking definition is the game Spacewar, the first interactive video game. Developed by MIT hackers in the early 1960s, Spacewar had all the traditional hacking definitions: it was goofy and random, serving little useful purpose other than providing a nightly distraction for the dozen or so hackers who delighted in playing it. From a software perspective, however, it was a monumental testament to innovation of programming skill. It was also completely free. Because hackers had built it for fun, they saw no reason to guard their creation, sharing it extensively with other programmers. By the end of the 1960s, Spacewar had become a favorite diversion for mainframe programmers around the world.
This notion of collective innovation and communal software ownership distanced the act of computer hacking in the 1960s from the tunnel hacking and phone hacking of the 1950s. The latter pursuits tended to be solo or small-group activities. Tunnel and phone hackers relied heavily on campus lore, but the off-limits nature of their activity discouraged the open circulation of new discoveries. Computer hackers, on the other hand, did their work amid a scientific field biased toward collaboration and the rewarding of innovation. Hackers and "official" computer scientists weren't always the best of allies, but in the rapid evolution of the field, the two species of computer programmer evolved a cooperative-some might say symbiotic-relationship.
It is a testament to the original computer hackers' prodigious skill that later programmers, including Richard M. Stallman, aspired to wear the same hacker mantle. By the mid to late 1970s, the term "hacker" had acquired elite connotations. In a general sense, a computer hacker was any person who wrote software code for the sake of writing software code. In the particular sense, however, it was a testament to programming skill. Like the term "artist," the meaning carried tribal overtones. To describe a fellow programmer as hacker was a sign of respect. To describe oneself as a hacker was a sign of immense personal confidence. Either way, the original looseness of the computer-hacker appellation diminished as computers became more common.
As the definition tightened, "computer" hacking acquired additional semantic overtones. To be a hacker, a person had to do more than write interesting software; a person had to belong to the hacker "culture" and honor its traditions the same way a medieval wine maker might pledge membership to a vintners' guild. The social structure wasn't as rigidly outlined as that of a guild, but hackers at elite institutions such as MIT, Stanford, and Carnegie Mellon began to speak openly of a "hacker ethic": the yet-unwritten rules that governed a hacker's day-to-day behavior. In the 1984 book Hackers, author Steven Levy, after much research and consultation, codified the hacker ethic as five core hacker tenets.
In many ways, the core tenets listed by Levy continue to define the culture of computer hacking. Still, the guild-like image of the hacker community was undermined by the overwhelmingly populist bias of the software industry. By the early 1980s, computers were popping up everywhere, and programmers who once would have had to travel to top-rank institutions or businesses just to gain access to a machine suddenly had the ability to rub elbows with major-league hackers via the ARPAnet. The more these programmers rubbed elbows, the more they began to appropriate the anarchic philosophies of the hacker culture in places like MIT. Lost within the cultural transfer, however, was the native MIT cultural taboo against malicious behavior. As younger programmers began employing their computer skills to harmful ends-creating and disseminating computer viruses, breaking into military computer systems, deliberately causing machines such as MIT Oz, a popular ARPAnet gateway, to crash-the term "hacker" acquired a punk, nihilistic edge. When police and businesses began tracing computer-related crimes back to a few renegade programmers who cited convenient portions of the hacking ethic in defense of their activities, the word "hacker" began appearing in newspapers and magazine stories in a negative light. Although books like Hackers did much to document the original spirit of exploration that gave rise to the hacking culture, for most news reporters, "computer hacker" became a synonym for "electronic burglar."
Although hackers have railed against this perceived misusage for nearly two decades, the term's rebellious connotations dating back to the 1950s make it hard to discern the 15-year-old writing software programs that circumvent modern encryption programs from the 1960s college student, picking locks and battering down doors to gain access to the lone, office computer terminal. One person's creative subversion of authority is another person's security headache, after all. Even so, the central taboo against malicious or deliberately harmful behavior remains strong enough that most hackers prefer to use the term " cracker"-i.e., a person who deliberately cracks a computer security system to steal or vandalize data-to describe the subset of hackers who apply their computing skills maliciously.
This central taboo against maliciousness remains the primary cultural link between the notion of hacking in the early 21st century and hacking in the 1950s. It is important to note that, as the idea of computer hacking has evolved over the last four decades, the original notion of hacking-i.e., performing pranks or exploring underground tunnels-remains intact. In the fall of 2000, the MIT Museum paid tradition to the Institute's age-old hacking tradition with a dedicated exhibit, the Hall of Hacks. The exhibit includes a number of photographs dating back to the 1920s, including one involving a mock police cruiser. In 1993, students paid homage to the original MIT notion of hacking by placing the same police cruiser, lights flashing, atop the Institute's main dome. The cruiser's vanity license plate read IHTFP, a popular MIT acronym with many meanings. The most noteworthy version, itself dating back to the pressure-filled world of MIT student life in the 1950s, is "I hate this fucking place." In 1990, however, the Museum used the acronym as a basis for a journal on the history of hacks. Titled, The Institute for Hacks Tomfoolery and Pranks, the journal offers an adept summary of the hacking.
"In the culture of hacking, an elegant, simple creation is as highly valued as it is in pure science," writes Boston Globe reporter Randolph Ryan in a 1993 article attached to the police car exhibit. "A Hack differs from the ordinary college prank in that the event usually requires careful planning, engineering and finesse, and has an underlying wit and inventiveness," Ryan writes. "The unwritten rule holds that a hack should be good-natured, non-destructive and safe. In fact, hackers sometimes assist in dismantling their own handiwork."
The urge to confine the culture of computer hacking within the same ethical boundaries is well-meaning but impossible. Although most software hacks aspire to the same spirit of elegance and simplicity, the software medium offers less chance for reversibility. Dismantling a police cruiser is easy compared with dismantling an idea, especially an idea whose time has come. Hence the growing distinction between "black hat" and "white hat"-i.e., hackers who turn new ideas toward destructive, malicious ends versus hackers who turn new ideas toward positive or, at the very least, informative ends.
Once a vague item of obscure student jargon, the word "hacker" has become a linguistic billiard ball, subject to political spin and ethical nuances. Perhaps this is why so many hackers and journalists enjoy using it. Where that ball bounces next, however, is anybody's guess.