back door

n 1. a door at the rear or side of a building 2. a means of entry to a job, position, etc, that is secret, underhand, or obtained through influence 3. (as modifier): a backdoor way of making firms pay more.

back′ door′

n. a secret, furtive, illicit, or indirect method or means. [1520–30] back′door′, adj.

Thesaurus

Noun	1.	back door - a secret or underhand means of access (to a place or a position); "he got his job through the back door"backdooraccess - the act of approaching or entering; "he gained access to the building"
	2.	back door - an undocumented way to get access to a computer system or the data it containsbackdooraccess code, access - a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)
	3.	back door - an entrance at the rear of a buildingback entrance, backdoorexterior door, outside door - a doorway that allows entrance to or exit from a building

Translations

a due case di distanzaporta di servizio

back door

(security)(Or "trap door", "wormhole"). A hole in thesecurity of a system deliberately left in place by designersor maintainers. The motivation for such holes is not alwayssinister; some operating systems, for example, come out ofthe box with privileged accounts intended for use by fieldservice technicians or the vendor's maintenance programmers.See also iron box, cracker, worm, logic bomb.

Historically, back doors have often lurked in systems longerthan anyone expected or planned, and a few have become widelyknown. The infamous RTM worm of late 1988, for example,used a back door in the BSD Unix "sendmail(8)" utility.

Ken Thompson's 1983 Turing Award lecture to the ACMrevealed the existence of a back door in early Unix versionsthat may have qualified as the most fiendishly clever securityhack of all time. The C compiler contained code that wouldrecognise when the "login" command was being recompiled andinsert some code recognizing a password chosen by Thompson,giving him entry to the system whether or not an account hadbeen created for him.

Normally such a back door could be removed by removing it fromthe source code for the compiler and recompiling the compiler.But to recompile the compiler, you have to *use* the compiler- so Thompson also arranged that the compiler would *recognisewhen it was compiling a version of itself*, and insert intothe recompiled compiler the code to insert into the recompiled"login" the code to allow Thompson entry - and, of course, thecode to recognise itself and do the whole thing again the nexttime around! And having done this once, he was then able torecompile the compiler from the original sources; the hackperpetuated itself invisibly, leaving the back door in placeand active but with no trace in the sources.

The talk that revealed this truly moby hack was published as["Reflections on Trusting Trust", "Communications of the ACM27", 8 (August 1984), pp. 761--763].

back door

A secret way to take control of a computer. Also called "trap doors," back doors are built into software by the original programmer, who can gain access to the computer by entering a code locally or remotely. For example, a back door in an application would enable a person to activate either normal or hidden functions within the software. A back door in an operating system would provide access to all system functions in the computer. See Easter Egg and Back Orifice.

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Synonyms for back door

noun a secret or underhand means of access (to a place or a position)

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noun an undocumented way to get access to a computer system or the data it contains

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noun an entrance at the rear of a building

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