STEM与日常科技·英语30篇（1）
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Why Two-Factor Authentication Adds Critical Security
双因素认证为何提供关键安全保障
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Two-factor authentication (2FA) requires two independent proofs of identity: something you know and something you have—or are.
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Even if hackers steal your password, they still need your phone, security key, or biometric scan to access the account.
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Time-based one-time passwords (TOTP) change every 30 seconds, making intercepted codes useless after a short window.
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Physical security keys use cryptographic signing that cannot be phished or remotely cloned like SMS codes can.
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SMS-based 2FA is weaker because attackers can hijack phone numbers via SIM swapping or intercept text messages.
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Biometric 2FA, like fingerprint or face scans, ties verification to unique physical traits stored locally on your device.
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Services offering 2FA see up to 99% fewer unauthorized account takeovers compared to password-only logins.
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Enabling 2FA on email, banking, and cloud accounts creates a powerful barrier against bulk credential attacks.
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Modern 2FA standards like FIDO2 eliminate shared secrets entirely, relying instead on public-key cryptography.
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Adding just one extra step dramatically raises the cost and difficulty for attackers targeting everyday digital identities.