authenticator

[aw-then-ti-key-ter]

noun

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for authenticator

Contemporary Examples of authenticator

According to one authenticator of sports memorabilia, his clients are not optimistic.
Tiger on Sale
Duff McDonald
December 8, 2009