Abstract: As for the traditional digital chaos-based scheme being not directly applicable for WSN because some sensor node does not support the float type of computation, integer chaotic maps and its block encryption schemes are firstly introduced, and then a novel chaos-based message authentication code (MAC) scheme was proposed, which was length changeable with high-level hybrid chaotic security. At last, a security application solution for data communication on WSN employing the proposed chaos-based schemes is presented, and the performance evaluation on the real-world Mica2 node is analyzed to show that the new security solution is more applicable for WSN than the current most popular security scheme, TinySec.