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A keygen is a technique for copying software keys, usually to give unauthorized users access to restricted features. The term is used primarily in the computer security field, where it has negative connotations. A keygen may be implemented as a riffle shuffling algorithm, or an asymmetric encryption algorithm which uses different decryption algorithms for each user account. Keygens are typically anti-debugging techniques that can prevent users from disassembling and tracing the source code of software running on their computers. The term "keygen" comes from "key generator", because early key generator programs were used primarily to generate keys for copy protection schemes; however, this meaning dates back only to 1982 or 1983. Since many legitimate software vendors have taken to restricting their software in ways that require hardware keys or serial numbers, the practice of keygenning has become less of a hacker prank and more an attempt to bypass otherwise prohibitively expensive licensing schemes. In particular, the shift from floppy disks to CDs and DVDs means that copying a lot of data will almost certainly result in an unusable disk due to scratches on the disk, while a regularly used CD starts out with numerous scratches. Also, the shift from single-purpose computers such as home-office "microcomputers" or word processors to all-purpose desktop computers means that some software is only usable on the computer it comes with. The term "keygen" was first published in the January 1983 issue of "BYTE" magazine. Early keygens were used primarily to generate keys for copy protection schemes, but this meaning dates only to 1983 or 1984. The word also appears in the "Reference Manual For The International Data Encryption Algorithm (IDEA)" published in 1982, which states that the tool was "designed to assist in generating cryptographic keys without resorting to lengthy and complex mathematical calculations." Another use of the term appeared in Commodore's 1983 product brochure for their new Amiga 1000 computer. Commodore's documentation stated that "[the] keygen program is used to create key files which can then be used with software key generators. This can be very useful in situations where you have been given a copy of a software application, but the original software is no longer available." In 1984 there was a book by John L. Flynn, "The Key Generation Computer Program" which states that "KEYGEN is a program for generating keys" and ""KEYGEN-3.0 is a simplified version of the program in which the input data are restricted to letters, digits and punctuation marks. The program can also be used in order to generate key files in various cases when the user has lost or forgotten his or her computer key." In 1985, Commodore sold its Amiga 1000 computer line under their Amiga2000 brand name. The Amiga2000 was a rebadged Amiga 1000 with a hard disk and a built-in word processor. Commodore advertised that, by using "Commodore's word processing keygen program", one could "generate the necessary key file from any standard word processor." In 1986, Infocom released a text-based video game called "Ballyhoo", which only operated if the copy protection scheme was defeated using a keygen. Infocom learned from this experience on their next game, "Hollywood Hijinx". Their manual clearly stated that "Hollywood Hijinx is copy protected, but it is not intended to be difficult for you to copy it. cfa1e77820