Week 4 AALs + Authentication Types

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Last updated 5:00 PM on 9/26/26
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4 Terms

1
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AAL1

  • Single-factor authentication (e.g., password or SMS code alone)

  • Lower resistance to phishing or credential theft


2
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AAL2

  • Multi-factor authentication (MFA) required

  • Stronger cryptographic protections

  • Includes OTP hardware tokens, app-based authenticators, or biometrics


3
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AAL3

  • Highest assurance level intended for high-risk systems

  • Requires hardware-based cryptographic authenticators with proof-of-possession and

    resistance to phishing/malware


4
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Categories of Authenticators

  • Knowledge-Based (Something You Know)

  • Possession-Based (Something You Have)

  • Biometric (Something You Are)