多涡卷混沌吸引子的主要特点是具有复杂的混沌动力学行为和多个螺旋密钥参数，可在保密通信中获得应用。在研究其产生机理的基础上，进一步提出了用多涡卷混沌系统实现多进制数字混沌键控(MDCSK)的一种方案。其工作原理是，在发送端，用多进制数字信号对多涡卷混沌吸引子的多个斜率值进行数字调制，从而产生多进制混沌键控信号。在接收端，根据驱动-响应式同步和相关解调原理恢复出原来的多进制数字信号。与二进制混沌键控(CSK)相比，多进制数字混沌键控(MDCSK)方式能体现出利用多个螺旋密钥参数来加密多进制数字信号这一主要优点。通过该方案的理论分析和计算机模拟结果，证实了这一方法的有效性。

The main feature of multiple-scroll chaotic attractors is that they exhibit a rich variety of complicated chaotic dynamic phenomena and have many scroll encryption parameters that can be applied to secure communications. Based on the study of their generating mechanism, a novel scheme of multi-level digital chaos shift keying (MDCSK) via multi-scroll chaotic systems is presented. In the transmitter, the slope values of the multiple scroll chaotic attractors are modulated using multi-level digital signals, which generates MDCSK signals. In the receiver, the original multi-level digital signals are recovered according to the principle of drive-response synchronization and coherent demodulation. Compared with chaos shift keying (CSK), MDCSK has an advantage that multi-level digital signals can be encrypted, by using multi-scroll encryption parameters. Results of theoretical analysis and computer simulation are also given, which demonstrates the effectiveness of the proposed method.