the.com/authentication

Proving you are who you claim, one password at a time, badly.

means The process of verifying that someone or something is genuinely what it claims to be, usually by checking a password, key, or ID.

from From Greek 'authentikos,' meaning genuine or original, itself tied to 'authentes'—one who acts with authority, or does something with their own hand. It passed through Latin and French before settling into English as 'authentic' by the late medieval period, with 'authentication' following later as the noun for the act of proving that genuineness. The word has always carried this double sense: not just real, but verified as real by someone with the standing to say so.

vs authorization
Authentication proves who you are, authorization decides what you can do
three factors
something you know, have, or are
MFA logic
stacking weak factors to approximate one strong one
oldest method
passwords predate computers, used by Roman military sentries
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