This is a key. This is an authentication code. This is an algorithm. This is testing exactly who you are and whether we feel that it is okay to let you in. How will you tell us who you are. Will you sit in a particular order, in a line, and then enter one by one, with a hug and a kiss on each cheek? Or will you walk in pairs, and shake hands as you cross our threshold? We must authenticate you. ʻO wai kou inoa? No hea mai ʻoe? (No hea mai kou ʻohana?) TCP/IP. A password on the login screen. Authenticate yourself.