He tukanga e whai mana ai te tangata ki te hou atu ki tētahi rorohiko, pūnaha rorohiko rānei ki te whakamahi i ngā papatono, kia whai wāhi hoki ki ngā kōrero e noho ana ki reira. I te nuinga o te wā, mā te tuhi i tana ingoa kaiwhakamahi me tana kupuhuna, ā, ka kīia tērā tukanga ko te takiuru. Mā te motuhēhēnga e noho haumaru ai ngā kōrero me ngā raraunga e puritia ana ki te rorohiko, kia kore ai e taea atu e te tangata kāore e whai mana ana ki aua kōrero.
A process that allows a person to get into a computer or computer system, use its programs and access the information that it holds. Usually this is by way of entering a username and password, a process known as login. Authentication ensures the information and data held on the computer is safe and cannot be accessed by someone without the correct authority.