Encoding scheme of efficient shorter 2-secure digital fingerprint
一种有效减少码字长度的两用户合谋安全指纹编码方案

A 2-secure fingerprint using concatenated codes was proposed.Its tracing algorithm was described.A new code constructed in reference4] was used as inner code,and q-ary random integers were used as outer code.This code can trace at least one traitor when users increase but the length of codes doesn't increase.