理想的情况下，使用基于哈布的消息验证码(HMAC)，因为它最安全。

Ideally, use hash-based message authentication code (HMAC) because it's the most secure.

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研究了基于非正规LDPC系统码的非理想中继协作通信系统。

The performance of irregular systematic LDPC-coded non-ideal relay cooperative communication system is studied.

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用最大距离可分码构造了一个理想门限体制，该体制中的秘密恢复算法可以正确地恢复秘密，并可检测出伪造的秘密份额，确定伪造者的身份。

An ideal threshold scheme is constructed from Maximum Distance Separable (MDS) codes, the recovery algorithm in this scheme can detect cheating, recover the correct secret and identify cheaters.

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