Online Dictionary

back door Explained

back door at English => English (Longman) Of Explained:

n [C]
1 a door at the back or side of a building:
2 get in through the back door: to achieve something by having an unfair secret advantage// --His father works for the company so he got in through the back door.//

back door at English => English (GNU/Linux) Of Explained:

n. [common] A hole in the security of a system deliberately left in place by designers or maintainers. The motivation for such holes is not always sinister; some operating systems, for example, come out of the box with privileged accounts intended for use by field service technicians or the vendor's maintenance programmers. Syn. trap door; may also be called a 'wormhole'. See also iron box, cracker, worm, logic bomb. Historically, back doors have often lurked in systems longer than anyone expected or planned, and a few have become widely known. Ken Thompson's 1983 Turing Award lecture to the ACM admitted the existence of a back door in early Unix versions that may have qualified as the most fiendishly clever security hack of all time. In this scheme, the C compiler contained code that would recognize when the 'login' command was being recompiled and insert some code recognizing a password chosen by Thompson, giving him entry to the system whether or not an account had been created for him. Normally such a back door could be removed by removing it from the 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 recognize when it was compiling a version of itself, and insert into the recompiled compiler the code to insert into the recompiled 'login' the code to allow Thompson entry -- and, of course, the code to recognize itself and do the whole thing again the next time around! And having done this once, he was then able to recompile the compiler from the original sources; the hack perpetuated itself invisibly, leaving the back door in place and active but with no trace in the sources. The talk that suggested this truly moby hack was published as "Reflections on Trusting Trust", "Communications of the ACM 27", 8 (August 1984), pp. 761-763 (text available at Ken Thompson has since confirmed that this hack was implemented and that the Trojan Horse code did appear in the login binary of a Unix Support group machine. Ken says the crocked compiler was never distributed. Your editor has heard two separate reports that suggest that the crocked login did make it out of Bell Labs, notably to BBN, and that it enabled at least one late-night login across the network by someone using the login name 'kt'. From Jargon Dictionary

back door at English => English (Moby Thesaurus II) Of Explained:

105 Moby Thesaurus words for "back door":
French door, afterpart, afterpiece, archway, back, back road,
back seat, back side, back stairs, back street, back way,
backstairs, barway, behind, bolt-hole, breech, bulkhead, by-lane,
bypass, bypath, byroad, bystreet, byway, carriage entrance,
cellar door, cellarway, clandestine, covert, covert way, detour,
door, doorjamb, doorpost, doorway, escalier derobe, escape hatch,
escape route, feline, front door, furtive, gate, gatepost, gateway,
hatch, hatchway, heel, hidlings, hind end, hind part, hindhead,
hole-and-corner, hugger-mugger, lintel, occiput, porch, portal,
porte cochere, posterior, postern, privy, propylaeum, pylon, quiet,
rear, rear end, rearward, reverse, roundabout way, scuttle,
secret exit, secret passage, secret staircase, shifty, side door,
side road, side street, skulking, slinking, slinky, sly, sneaking,
sneaky, stealthy, stern, stile, storm door, surreptitious, tail,
tail end, tailpiece, threshold, tollgate, trap, trap door,
turnpike, turnstile, under-the-counter, under-the-table,
undercover, underground, underground railroad, underground route,
underhand, underhanded, unobtrusive

Back door at English => English (Websters 1913) Of Explained:

Back door \Back" door"\
A door in the back part of a building; hence, an indirect
way. --Atterbury.

back door at English => English (WordNet) Of Explained:

back door
n 1: a secret or underhand means of access (to a place or a
position); "he got his job through the back door"
2: an entrance at the rear of a building [syn: {back entrance}]

back door at English (WD) Of Explained:


Alternative forms

* backdoor
  • back-door


    Inter: en-noun » head=back door

  • A subsidiary entrance to a building or house at its rear, normally away from the street.
    1. A means of access, often secret and unprotected, to something.
    2. Inter: computin » g A secret means of access to a program or system.
    3. Inter: slan » g The anus, generally used in reference to anal sex.

      Related terms

      * back-door man


      Inter: trans-top » subsidiary entrance to building

  • Bulgarian: Inter: t- » bg|заден вход
  • Finnish: Inter: t- » fi|takaovi, Inter: t- » fi|sivuovi
  • German: Inter: t+ » de|Hintertür|f

  • Inter: trans-mi » d
    • Italian: Inter: t- » it|porta di dietro|f
    • Norwegian: Inter: t- » no|bakdør|m
    • Swedish: Inter: t- » sv|bakdörr|c
    • Welsh: Inter: t- » cy|drws cefn

    Inter: trans-botto » m
    Inter: trans-top » secret, unprotected means of access
    • Finnish: Inter: t- » fi|takaovi, Inter: t- » fi|takaportti
    • German: Inter: t+ » de|Hintertür|f
    • Greek: Inter: t+ » el|κερκόπορτα|tr=kerkóporta|f

    Inter: trans-mi » d
  • Icelandic: leynilegur; laumulegur
  • Norwegian: Inter: t- » no|bakdør|m

  • Inter: trans-botto » m
    Inter: trans-top » slang: anus
    • Finnish: Inter: t- » fi|takaovi

    Inter: trans-mi » d
    Inter: trans-botto » m
    Inter: checktrans-to » p
    • Dutch: achterdeur Inter: f » m

    Inter: trans-mi » d
  • Japanese: 裏口 (uraguchi); 勝手口 (katteguchi)

  • Inter: trans-botto » m


    Inter: en-adj » head=back door|-
  • Inter: US » baseball The path of a pitch which starts outside and then slides over the plate.
    1. : He has a nasty back door slider.

      Related terms

      * back door slider


      Inter: en-verb » head=back door

  • To attempt to accomplish by indirect means, especially when direct means are proscribed.
  • Inter: surfin » g To enter a tube by accelerating from behind; to surf into an already formed hollow wave, in contrast to the normal method of slowing to allow a surfable wave to form.
  • 1999, Mark Warren, Mark Warrens Atlas of Australian Surfing, travellers edition 1999, ISBN 0-7322-6731-5, page 103
  • : If you survive the heavy take-off at The Chair' (which is very close to the rocks) you will find you're in 'The Suck-up', which offers either a spectacular barrel or a bonecrunching wipeout, but you might find you have to back door it.''


    Inter: trans-top » to attempt to accomplish by indirect means
  • Finnish: Inter: t- » fi|kähmiä

  • Inter: trans-mi » d
    Inter: trans-botto » m

    See also

    * front door

    External links

    * Inter: pedialite » Backdoor
    • Inter: pedialite » Backdoor (computing)

    Translation: et » back door
    Translation: id » back door
    Translation: it » back door
    Translation: ru » back door
    Translation: ta » back door
    Translation: zh » back door