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      <title>密码学的阿喀琉斯之踵：为什么「随机数」从来不是真正随机的？</title>
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      <description>深入剖析随机数生成器从真随机到伪随机的技术演进与安全困境。从Linux熵池到ChaCha20 CSPRNG，从Debian OpenSSL漏洞到PS3 ECDSA破解，再到Dual EC DRBG后门争议，系统梳理随机数在密码学中的核心地位与潜在陷阱。揭示熵源、种子、状态空间如何决定密码系统的生死存亡，以及开发者在实际工程中应当如何正确使用随机数生成器。</description>
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