authentication vs confirmation

authentication

noun
  • something which validates or confirms the authenticity of something 

  • proof of the identity of a user logging on to some network 

  • a hallmark or assay-mark on a piece of metalwork 

confirmation

noun
  • A verification that something is true or has happened. 

  • An official indicator that things will happen as planned. 

  • A ceremony of sealing and conscious acknowledgement of the faith in many Christian churches, typically around the ages of 14 to 18; considered a sacrament in some churches, including Catholicism, but not in most Protestant churches. 

  • An act whereby something conditional or voidable is made sure and unavoidable, especially the possession of an estate. 

How often have the words authentication and confirmation occurred in a corpus of books? (source: Google Ngram Viewer )