Furthermore, two other secure chaotic systems are also built on the basic NDF, which are named feedforward-feedback NDF (FFNDF) and NDF-based coupled map lattice (NDF-CML) respectively.

• 然后以NDF为基本单元，将其分别扩展为前馈-反馈NDF安全混沌模型(FFNDF)和基于NDF的耦合映像格时空混沌模型(NDF-CML)。