code distance meaning in English

代码间隔
代码间距
码距离

Minimum code distance
最小码距离
The first kind of algorithm is based on s - box controlled by key , the algorithm distinguishes most of other block ciphers , its visible quality is that its s - box is not regular and fixative , but controlled by block cipher ' s key . the second kind of algorithm is based on smn ( d ) array code , it makes full use of the visible quality of smn ( d ) array code possessing big code distance ( d ) . the thesis discusses the two algorithms " reversibility , security and their qualities , the
第一种是基于“ s -盒由密钥控制”的变结构分组密码，该算法区别于其它大部分分组密码最大的特点是它的s -盒不是固定不变的而是由密钥控制产生；第二种是基于smn ( d )阵列编码的变结构分组密码，该算法充分利用了smn ( d )阵列编码具有码距大的特点；文中对这两个算法的可逆性、安全性及其性能等进行了探讨和分析，分析结果认为这两个变结构算法正确、有效且安全。