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.双重身份验证（2FA）需要两种独立的身份证明：你知道的（如密码）和你拥有的（如手机）或你本人（如生物特征）。
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Even if hackers steal your password, they still need your phone, security key, or biometric scan to access the account.即使黑客窃取了你的密码，仍需你的手机、安全密钥或生物特征扫描才能登录账户。
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Time-based one-time passwords (TOTP) change every 30 seconds, making intercepted codes useless after a short window.基于时间的一次性密码（TOTP）每30秒更新一次，截获的密码在极短时间内即失效。
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Physical security keys use cryptographic signing that cannot be phished or remotely cloned like SMS codes can.物理安全密钥采用加密签名技术，无法像短信验证码那样被钓鱼或远程复制。
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SMS-based 2FA is weaker because attackers can hijack phone numbers via SIM swapping or intercept text messages.基于短信的2FA安全性较弱，因为攻击者可通过SIM卡劫持或拦截短信获取验证码。
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Biometric 2FA, like fingerprint or face scans, ties verification to unique physical traits stored locally on your device.指纹或人脸扫描等生物特征2FA，将验证绑定至设备本地存储的唯一生理特征。
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Services offering 2FA see up to 99% fewer unauthorized account takeovers compared to password-only logins.启用2FA的服务相比仅用密码登录，未授权账户接管事件最多可减少99%。
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Enabling 2FA on email, banking, and cloud accounts creates a powerful barrier against bulk credential attacks.为邮箱、银行及云账户启用2FA，能有效抵御大规模凭据攻击。
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Modern 2FA standards like FIDO2 eliminate shared secrets entirely, relying instead on public-key cryptography.FIDO2等现代2FA标准彻底摒弃共享密钥，转而依赖公钥加密技术。
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Adding just one extra step dramatically raises the cost and difficulty for attackers targeting everyday digital identities.仅增加一个额外验证步骤，即可显著提高攻击者针对日常数字身份的攻击成本与难度。