本文闡述了IP 報文標識字段比特流隨機性的評價標準，通過對大量實測報文進行統計分析證明了比特流的匹配位置對隨機測度值有一定影響。結果表明，標識字段比特流隨機測度值隨著比特流長度的增加整體上呈遞減趨勢。對相同長度的比特流而言，右優先比特流隨機測度值普遍最高，左優先比特流隨機測度值普遍最低，其它位置比特流隨機測度值普遍介于兩者之間。
關鍵詞：隨機測度；比特流；標識字段；IP 報文
This paper expounds the evaluation standards for bit flow randomicity of IP message
identification field. By accounting and analysing a large number of messages,it is proved that
the matching position effects bit flow random metric. The result of the experiment shows that
with the increase of the length ,the random metric of bit flow tends to reduce gradually. In
respect of the same length of the bit flow , right priority random metric is universally the
highest, and the left priority one is universally the lowest with others between the two.
Key Words: Random Metric；Bit Flow；Identification Field；IP Message