Virus

SEX

[Sun Users' Group & elsewhere] n.

Software EXchange. A technique invented by the blue-green algae hundreds of millions of years ago to speed up their evolution, which had been terribly slow up until then. Today, SEX parties are popular among hackers and others (of course, these are no longer limited to exchanges of genetic software). In general, SEX parties are a {Good Thing}, but unprotected SEX can propagate a {virus}. See also {pubic directory}.
The rather Freudian mnemonic often used for Sign EXtend, a machine instruction found in the {PDP-11} and many other architectures. The RCA 1802 chip used in the early Elf and SuperElf personal computers had a `SEt X register' SEX instruction, but this seems to have had little folkloric impact. The Data General, instruction set also had SEX.
{DEC}'s engineers nearly got a {PDP-11} assembler that used the SEX mnemonic out the door at one time, but (for once) marketing wasn't asleep and forced a change. That wasn't the last time this happened, either. The author of The Intel 8086 Primer, who was one of the original designers of the 8086, noted that there was originally a SEX instruction on that processor, too. He says that Intel management got cold feet and decreed that it be changed, and thus the instruction was renamed CBW and CWD (depending on what was being extended). Amusingly, the Intel 8048 (the microcontroller used in IBM, PC, keyboards) is also missing straight SEX but has logical-or and logical-and instructions ORL and ANL.

The Motorola 6809, used in the Radio Shack Color Computer and in U.K.'s `Dragon 32' personal computer, actually had an official SEX instruction; the 6502 in the Apple II with which it competed did not. British hackers thought this made perfect mythic sense; after all, it was commonly observed, you could (on some theoretical level) have sex with a dragon, but you can't have sex with an apple.

Marcadores: apple, Computer, Hardware, IBM, PDP-11, Software, Virus

# 5/19/2009 06:31:00 PM, Comentários, Links para esta postagem,

[from the obvious analogy with biological viruses, via SF] A cracker program that searches out other programs and `infects' them by embedding a copy of itself in them, so that they become {Trojan horse}s. When these programs are executed, the embedded virus is executed too, thus propagating the `infection'. This normally happens invisibly to the user. Unlike a {worm}, a virus cannot infect other computers without assistance. It is propagated by vectors such as humans trading programs with their friends (see {SEX}). The virus may do nothing but propagate itself and then allow the program to run normally. Usually, however, after propagating silently for a while, it starts doing things like writing cute messages on the terminal or playing strange tricks with the display (some viruses include nice {display hack}s). Many nasty viruses, written by particularly perversely minded {cracker}s, do irreversible damage, like nuking all the user's files.
In the 1990s, viruses became a serious problem, especially among Windows users; the lack of security on these machines enables viruses to spread easily, even infecting the operating system (Unix machines, by contrast, are immune to such attacks). The production of special anti-virus software has become an industry, and a number of exaggerated media reports have caused outbreaks of near hysteria among users; many {luser}s tend to blame everything that doesn't work as they had expected on virus attacks. Accordingly, this sense of virus has passed not only into techspeak but into also popular usage (where it is often incorrectly used to denote a {worm} or even a {Trojan horse}). See {phage}; compare {back door}; see also {Unix conspiracy}.

letterbomb

n. A piece of {email} containing {live data} intended to do nefarious things to the recipient's machine or terminal. It used to be possible, for example, to send letterbombs that would lock up some specific kinds of terminals when they are viewed, so thoroughly that the user must cycle power (see {cycle}, sense 3) to unwedge them. Under Unix, a letterbomb can also try to get part of its contents interpreted as a shell command to the mailer. The results of this could range from silly to tragic; fortunately it has been some years since any of the standard Unix/Internet mail software was vulnerable to such an attack (though, as the Melissa virus attack demonstrated in early 1999, Microsoft systems can have serious problems). See also {Trojan horse}; compare {nastygram}.
Loosely, a mailbomb.

Vírus

Código escrito com a intenção expressa de replicar-se. Um vírus tenta espalhar-se de computador para computador anexando-se a um programa hospedeiro. Ele pode danificar hardware, software ou dados. Compare com worm. Veja também a definição fornecida pela Virus Info Alliance (f-secure.com).

Marcadores: Security, Software, Virus, Vulnerabilidade

# 7/20/2007 09:00:00 PM, Comentários, Links para esta postagem,

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