据史料记载,最早制定军队通讯密码的是周代著名军事家大公望(即姜子牙).他制定了阴符和阴书.阴符是制造一套尺寸不等、形状各异的符号,共8种,每种都代表一定的意义:大胜克敌符,长1尺;破阵擒将符,长9寸;降城得邑符,长8寸;却敌极远符,长7寸;警众坚守符,长6寸;请粮五兵符,长5寸.败军亡将符,长4寸;失利亡士符,长3寸. According to historical records, the earliest formulation of the military communications password is the famous military strategist Daigong Wang (ie, Zi Zi) .He established Yin and Yin books. Yin Fu is the manufacture of a set of sizes, different shapes symbols, a total of 8 Species, each representing a certain significance: the victory of grams of enemy, 1-foot long; broken array will catch, length 9 inches; Police adhere to the symbol, 6 inches long; Please grain five arms, long 5 inches. The defeated army will be Fu, 4-inch long;