a person or thing that authenticates.
Cryptography. a code used to authenticate a previously transmitted code.

Origin of authenticator

First recorded in 1860–65; authenticate + -or2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for authenticator

Contemporary Examples of authenticator

  • According to one authenticator of sports memorabilia, his clients are not optimistic.

    The Daily Beast logo
    Tiger on Sale

    Duff McDonald

    December 8, 2009