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of 15What is Multi-Factor Authentication (MFA) and why is it important?
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Multi-Factor Authentication (MFA) is a security method that requires users to provide two or more different types of authentication factors to verify their identity before gaining access to a system, application, or resource.
MFA is important because:
- Enhanced Security: Even if one factor is compromised (like a password), attackers still need additional factors
- Reduces Risk: Significantly decreases the likelihood of unauthorized access
- Compliance: Many regulations (HIPAA, SOX, PCI DSS) require or recommend MFA
- Trust: Builds user and customer confidence in security measures
Example: A user logging into their bank account needs both their password (something they know) and a code from their mobile app (something they have).
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What are the three main categories of authentication factors?
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The three main categories of authentication factors are:
Something You Know (Knowledge Factor)
- Passwords, PINs, security questions
- Passphrases, patterns
Something You Have (Possession Factor)
- Mobile phones, hardware tokens, smart cards
- SMS codes, authenticator apps
Something You Are (Inherence Factor)
- Biometric identifiers like fingerprints, facial recognition
- Voice recognition, iris scans, retinal patterns
True MFA requires at least two different categories, not just two factors from the same category (like password + security question).
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What's the difference between Two-Factor Authentication (2FA) and Multi-Factor Authentication (MFA)?
Name and explain three common MFA methods used in modern applications.
What are the main security benefits of implementing MFA?
Explain the security differences between SMS-based MFA and app-based TOTP. Which would you recommend and why?
What is risk-based or adaptive authentication, and how does it enhance traditional MFA?
Explain how SAML SSO integrates with MFA and describe the authentication flow.
What are the common MFA bypass techniques that attackers use, and how can they be mitigated?
How does WebAuthn/FIDO2 differ from traditional MFA methods, and what are its advantages?
Design an enterprise MFA strategy for a company with 10,000 employees, multiple applications, and varying security requirements. What factors would you consider?
Explain the cryptographic principles behind TOTP and HOTP, including their vulnerabilities and implementation considerations.
How would you implement MFA for a microservices architecture with service-to-service authentication requirements?
Describe the security implications and implementation challenges of biometric authentication in MFA systems.
How would you design a threat model for an MFA system and what are the most critical attack scenarios to consider?
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