back door - definição. O que é back door. Significado, conceito
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O que (quem) é back door - definição

WIKIMEDIA DISAMBIGUATION PAGE
Back door (disambiguation); The Back Door; Backdoor (disambiguation); Back Door; Backdoor; Backdoors

back door         
<security> (Or "trap door", "wormhole"). 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. 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. 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 ACM revealed the existence of a back door in early Unix versions that may have qualified as the most fiendishly clever security hack of all time. The C compiler contained code that would recognise 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 *recognise 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 recognise 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 revealed this truly moby hack was published as ["Reflections on Trusting Trust", "Communications of the ACM 27", 8 (August 1984), pp. 761--763]. [Jargon File] (1995-04-25)
back door         
¦ noun
1. the rear door of a building.
2. [as modifier] underhand; clandestine: a back-door tax increase.
Phrases
by (or through) the back door in a clandestine or underhand way.
back door         

Wikipédia

Back door

A back door is a door in the rear of a building. Back door may also refer to:

Exemplos do corpo de texto para back door
1. Another man immediately opened the back door and got in.
2. The back door was open with blankets spilling out.
3. Foley likely entered through an unlocked back door, authorities said.
4. She fled through the back door with three of her children and heard window glass breaking.
5. The Doblo is the only one of our foursome that offers a hatchback style back door.