Based on the balance characteristic of the data-path when combining QDI asynchronous logic and the four-phase protocol with dual-rail encoding

the random swapping of the data-path rail can be implemented

so the balance of the average power for every data-path can be implemented

and the correlation between the data and the power can also be eliminated.But because of using the multiplexer for the random swapping

the current method will induce the system's ability of against power analysis attack to be weakened.So the method of QDI random data-path swapping

which is based on the metastability is put forward.By adopting the two-level swapping structure

the metastability generator and metastability filter

the random swapping between the data-path group and the data-path can be implemented.Simulation results show that

the method has the characteristic of preferable power balance

and the leakage of the side-channel information brought by the differences of the parasitic capacitor and the load capacitor

can also be counteracted.