The 5 Factors of Authentication

What is a factor?

Factor #1: Something you know

Are usernames and email addresses a something you know factor?

Factor #2: Something you have

RSA SecurID
Personal Identity Verification (PIV) card

Factor #3: Something you are

Factor #4: Somewhere you are

Factor #5: Something you do

SFA, 2FA or MFA?

Multi-step authentication vs Multi-factor authentication

Bonus content: Out-of-Band Authentication

Use of Short Message Service (SMS) for Out-of-Band Authentication

Conclusion

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