deauthenticate

de- +‎ authenticate

deauthenticate (third-person singular simple present deauthenticates, present participle deauthenticating, simple past and past participle deauthenticated)

1. (transitive) To reject as authentic; to falsify or disprove.
   • 1827, Jeremy Bentham, Rationale of Judicial Evidence:

     In the hand of what person soever it be alleged by the witness to be, a case may happen in which it may be material (though at the expense of a distinct enquiry) to authenticate or deauthenticate it by ulterior evidence.

2. (transitive, computing) To revoke the authentication of; to cause no longer to be authenticated.