1st computer virus is written, January 30, 1982
Richard Skrenta’s “Elk Cloner” was 400 lines long and disguised as an Apple boot program. (See Skrenta's current day photo, right)
Described by its author as "some dumb little practical joke,” the virus attached itself to the Apple DOS 3.3 operating system and spread by floppy disk.
Skrenta was already known as a video game prankster among his friends. He often shared his gaming software after altering the disks in a way that would interrupt the game with taunting messages. As such, some of his friends had stopped swapping games with him.
To continue pranking, Skrenta had to find a way to alter floppy disks without physically touching them. This lead him to create what is now known as a boot sector virus through Elk Cloner.
Skrenta left Elk Cloner residue in the operating system of his school's Apple II. Any student who did not do a clean reboot with their own disk could then be touched by the code.
An infected computer would display the following short poem on every 50th boot:
Elk Cloner: The program with a personality
It will get on all your disks
It will infiltrate your chips
Yes, it's Cloner!
It will stick to you like glue
It will modify RAM too
Send in the Cloner!
Considered very contagious, Elk Cloner successfully infected the floppies of most people Skrenta knew. That was considerably easy to do as in 1982 personal computing was still new and most were not wary of viruses, nor were virus scanner programs available. Elk Cloner could be removed, but it required an elaborate manual effort.
The term computer virus was first used in 1983 at a security seminar.
Skrenta went on to graduate from Northwestern in 1989 with a BA in computer science. According to Skrenta’s LinkedIn profile, he was CEO of search-engine start-up Blekko, and is now an executive director for IBM Watson. One LinkedIn recommendation for Skrenta reads: “Fear this man and his army of cyborgs.”
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For more moments in tech history, see this blog. EDN strives to be historically accurate with these postings. Should you see an error, please notify us.
Editor's note: This article was originally posted on January 30, 2013 and edited on January 30, 2018.