Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun authentication

2 senses of authentication

Sense 1
authentication, hallmark, assay-mark -- (a mark on an article of trade to indicate its origin and authenticity)
       => marker, marking, mark -- (a distinguishing symbol; "the owner's mark was on all the sheep")

Sense 2
authentication, certification -- (validating the authenticity of something or someone)
       => validation, proof, substantiation -- (the act of validating; finding or testing the truth of something)