1FA: your password 1.5FA: your password + SMS (poor man's 2FA) 2FA: your password + hardware-based or app-based OTP 3FA: your password + OTP + biometric reading (e.g. fingerprint reader that doubles as OTP device)
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Replying to @fchollet
4FA: all of the above + my unique consciousness hash
2 replies 0 retweets 11 likes
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