Secure Authentication

🔑 Key Takeaway: Authentication must prove identity with phishing-resistant factors where available — prefer hardware-backed MFA over SMS, and protect the SSO account that unlocks everything else.

Secure authentication verifies that only authorized people and services obtain sessions. Weak factors, SMS phishing, and unmonitored login anomalies are standard entry points into Web3 organization tooling and funds-adjacent systems.

Core methods

• Multi-factor authentication (MFA): Require multiple independent factors. Do not rely on SMS as the primary second factor for sensitive systems; prefer hardware security keys (for example YubiKey-class devices) or other phishing-resistant methods where platforms support them. See OpSec MFA.
• Single sign-on (SSO): SSO reduces password sprawl but concentrates risk on the identity provider account — that account must itself use strong MFA and hardened recovery paths.
• Password management: Enforce strong password policies and password managers for unique, high-entropy secrets. See Password management.

Practices

1. Require MFA for all team members on sensitive systems; prioritize hardware-backed factors for admins and finance.
2. Monitor and alert on suspicious authentication (repeated failures, impossible travel, new device enrollment).
3. Train staff on phishing of MFA prompts, recovery flows, and never sharing OTPs or seed material.

Further Reading

• IAM overview
• OpSec — Multi-Factor Authentication
• OpSec — Password Management
• OWASP Authentication Cheat Sheet
• NIST SP 800-63B