# unauthenticate
## English
### Etymology

From un- +‎ authenticate.

### Pronunciation

* Audio (US):(file)

### Verb

unauthenticate (third-person singular simple present unauthenticates, present participle unauthenticating, simple past and past participle unauthenticated)
* (transitive) To refuse to authenticate; to render inauthentic.
** 1783, [Thomas Tyers], An Historical Essay on Mr. Addison, London, page 27:But we may be more certain of the motive and merit of Addiſon, which was no leſs than the ſacrifice of old love (And O! how hard the ſcience to forget!) at the altar of Virtue (till ſome future Nævius ſhall diſpute the fact and unauthenticate the letter) than we are of Scipio’s difficulty in preferring paſſion to glory.
** 1903 August, Farran Zerbe, “Pick Ups During a Visit to the New Mint at Philadelphia”, in The Numismatist, volume 16, number 8, Monroe, Mich.: American Numismatic Association, page 246:No record was found pertaining to the 1804 dollar but on a slip of paper was found what is accepted as a satisfactory explanation of the always reported 321 silver dollars coined in 1805. No one has ever seen this coin and its non existance and the belief that none were issued has done much to unauthenticate the published records of our early coinage.
** 2015 March, Sargon George Donabed, “Conclusion” (chapter 8), in Reforging a Forgotten History: Iraq and the Assyrians in the Twentieth Century, Edinburgh: Edinburgh University Press, →DOI, →ISBN, page 265:What is more perplexing is the fact that the way to circumvent the issue for the post-modernist scholar and their paradigms is sometimes more damaging as in order to refrain from nullifying their ontological worldview, they deconstruct minority communities and unauthenticate them as such, providing themselves an escape clause from their ethical responsibility to the truth of existence and substantiation of meaning.
* (transitive, computing) To withdraw the authentication of.
** 2001, Blake Schwendiman, “Authentication” (chapter 8), in PHP4 Developer’s Guide, New York, N. Y.: McGraw-Hill, →ISBN, page 148:One advantage to using this approach is that you can “unauthenticate” a user at any time by sending the HTTP 401 header again. You may want to do this to force users to log in again after a certain timeout period or to provide different authentication requirements for the different areas of your application.
** 2002 June, John Viega, Matt Messier, Pravir Chandra, “Introduction” (chapter 1), in Network Security with OpenSSL, Sebastopol, Calif.: O'Reilly Media, Inc., →ISBN, page 26:You can set up the client not to authenticate, but if you do so, be warned that man-in-the-middle attacks will be easy to perform. Unauthenticating client proxies only buys you security against the most naïve eavesdropping attacks, but is still better than no protection at all.
** 2014, Bruce Schneier, “The Difficulty of Un-Authentication”, in Carry On: Sound Advice from Schneier on Security, Indianapolis, Ind.: John Wiley & Sons, Inc., →ISBN, page 237:This is important stuff, as anyone with an online bank account or remote corporate network knows. But a lot less thought and work have gone into the other end of the problem: how do you tell the system on the other end of the line that you’re no longer there? How do you unauthenticate yourself?