# back door
## English
### Alternative forms

* backdoor, back-door

### Pronunciation

* Audio (General Australian):(file)

### Noun

back door (plural back doors)
* A subsidiary entrance to a building or house at its rear, normally away from the street.
** 2023 January 11, Stephen Roberts, “Bradshaw's Britain: castles and cathedrals”, in RAIL, number 974, page 57:"Charles II, who was crowned here a little while before, occupied an old house (which is still standing) in New Street [Worcester], from which he escaped by the back door, as the enemy rushed in at the front."
* A means of access, often secret and unprotected, to something.
** 2021 November 29, Alan Shearer, “Why Newcastle have to win their next two games to give them hope of staying in the Premier League - Alan Shearer analysis”, in BBC Sport‎:Scoring three goals at home should guarantee you three points, but when you go on the attack a little bit more, you leave the back door open. That's not always a good idea with this team.
* (computer security) A secret means of access to a program or system.
* (automotive) A rear side door of a car, or at the back of a van.
* (slang) The anus; (by extension) anal sex.
    Synonym: backgate
    backdoor action
    go up the back door
** 1998 June 28, Michael Patrick King, “Valley of the Twenty-Something Guys”, in Sex and the City, season 1, episode 4, spoken by Samantha:Oh, don't be so judgmental. You could use a little back door.
* (golf, informal) The rear side of the hole, furthest from the golfer.
** 2010, Bob Glanville, Golf: The Game of Lessening Failures, page 14:Sometimes the ball will curve around and enter from the back-door.

#### Antonyms

* foredoor
* front door

#### Hyponyms

* bugdoor

#### Derived terms

* back-door bandit
* back-door man
* back-door pilot

#### Translations
### Adjective

back door (not comparable)
* (US, baseball) The path of a pitch which starts outside and then slides over the plate.
    He has a nasty back door slider.
* Achieved through indirect means.
* (poker, of a draw) Requiring consecutive cards on the turn and river to be achieved.
    The flop had the ace of spades, queen of spades, and two of diamonds, and I was holding the king of spades and the three of hearts. I bet big, hoping for a jack and a ten to make my back door straight-draw, or a spade to make my back door flush-draw. But when the turn card was the five of clubs, I had to fold.

#### Related terms

* back door slider

### Verb

back door (third-person singular simple present back doors, present participle back dooring, simple past and past participle back doored)
* To attempt to accomplish by indirect means, especially when direct means are proscribed.
* (surfing) 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 Warren's Atlas of Australian Surfing, traveller's, →ISBN, 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.
* (computer security) To add a backdoor (a secret means of access) to a program or system.
** 2018 February 26, Abhinav Singh, Nipun Jaswal, Monika Agarwal, Daniel Teixeira, Metasploit Penetration Testing Cookbook: Evade antiviruses, bypass firewalls, and exploit complex environments with the most widely used penetration testing framework, 3rd Edition, Packt Publishing Ltd, →ISBN, page 213:Now that we have backdoored the notepad.exe binary, we will go back to the Meterpreter session and upload our backdoor: 3. Then, we need to start a listener so we. meterpreter > upload notepad-backdoored.exe [*] uploading […]
** 2015 April 13, Elisabeth Oswald, Marc Fischlin, Advances in Cryptology – EUROCRYPT 2015: 34th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Sofia, Bulgaria, April 26-30, 2015, Proceedings, Part I, Springer, →ISBN, page 103:As an example, the generation algorithm for backdoored Dual EC picks a fixed group element Q, a random exponent d, and outputs as public key the pair P = Qd and Q. The secret key is d. (We use multiplicative notation for simplicity.) […]
** 2019 July 18, Gilberto Najera-Gutierrez, Juned Ahmed Ansari, Daniel Teixeira, Abhinav Singh, Improving your Penetration Testing Skills: Strengthen your defense against web attacks with Kali Linux and Metasploit, Packt Publishing Ltd, →ISBN, page 453:Back in the session, we will rename the httpd.exe file to httpd.exe.backup, upload the backdoored version, and rename it to httpd.exe: msf exploit(handler) > sessions -i 1 [*] Starting interaction with 1... meterpreter > cd […]

#### See also

* front door

### Further reading

* back door on Wikipedia.Wikipedia
* backdoor (computing) on Wikipedia.Wikipedia
* “back-door n.”, in Green’s Dictionary of Slang, Jonathon Green, 2016–present