authenticator

[aw-then-ti-key-ter]
noun
1.
a person or thing that authenticates.
2.
Cryptography. a code used to authenticate a previously transmitted code.

Origin:
1860–65; authenticate + -or2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
authenticate (ɔːˈθɛntɪˌkeɪt)
 
vb
1.  to establish as genuine or valid
2.  to give authority or legal validity to
 
authenti'cation
 
n
 
au'thenticator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It will also allow a much smaller cast member to authenticator ratio.
The preamble told the crew which edition and page number of a non sealed
  authenticator to use.
She will also attend the ceremony as the ship's keel-laying authenticator,
  signing the keel's plaque.
Each site has intrusion alarms that alert both the authenticator and digitizer
  when the wellhead terminal or vault door is opened.
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