Dependency-free Python toolkit for crypto CTF and real-world crypto assessment: LLL/Coppersmith (univariate, bivariate, linearization), RSA/DSA/ECDSA attacks, CRC/LFSR, PRNG recovery, ADFGX/ADFGVX, three-state verification. 零依赖的 Python 密码学 CTF 与实战评估工具箱：格与 Coppersmith、RSA/签名攻击、CRC/LFSR、PRNG 恢复、古典密码、三态验证。
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