随着码率的不断增加，酉空时码群中的各个星座点之间的乘积距离会变得越来越小，从而导致性能恶化。
With the increase of the code rate, the production distance between the constellation of the unitary group code decreases rapidly and deteriorates the performance of the system.
本文利用来自不同群的运算，构造一种能证明其安全性的杂凑算法，并应用已证明的结果构造安全的消息认证码。
The construction of a provable hash algorithm is developed based on the operations from various groups, also, a safety message authentication code is presented by the result.
本文给出了一种构造群同步特殊码组的方法。
This paper describes a method of constructing group synchronous special codes.
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