传统的线性移位寄存器序列具有递推性，导致密文抗攻击能力不强。
A traditional linear feedback successive-displacement register (LFSR) random sequence has recurrence character generally, so it makes the ability of anti-attacking of encrypted files poor.
该方案被认为是抗适应性选择密文攻击的实用方案之一，但缺乏严格的安全性证明。
This scheme is regarded as one of practical schemes against adaptively chosen ciphertext attacks, but it is absent of rigorous proofs.
提出两个抗选择密文攻击的门限密码系统。
Two threshold cryptosystems secure against chosen ciphertext attacks are proposed.
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