One thing that really disturbs me in professional documents is the use of authentification (or in Dutch: authentificatie). This word does not exist in English or in Dutch, it is a mix up of authentication and identification, but still this mistake is made all over the IT world in Europe.

Although the rule is very easy:

• when the verb is to authenticate it becomes authentication
• when the verb is to identify/to certify it becomes identification/certification

The verb to authentify or to authentificate simply do not exist in English....

So don't use it :-)