Abstract: A traitor tracing scheme on LIFP（large integer factoring problem）is proposed, the essential idea of which is that two special parameters A1 ,A2 are constructed,a pair （ail ,ai2 ） with respect to user i satisfiesaia＋ai2=h mod（φ （N） ）, where h is a constant

Key words: Traitor tracing, LIFP, Black-box tracing, Forward-security, Backward-security