Based on the limited resources of tiny terminals lead to the problem of single encryption algorithm

the S-box as the key components of the block cipher is reconfigurable designed. This paper put forward an 8-1 S box as the basic reconfigurable unit

converts S box of Boolean function expressions

with the method of grouping variable

and recursive calculation

dramatically reduced expression of and-item number

increase the utilization of intermediate results. On this basis

we design a reconfigurable unit S box

and under the TSMC 45 nm CMOS technology synthetically. The working frequency can reach 1.67 Ghz

compared with the existing research results

this design can well satisfy the current demand of the speed of the microprocessor. At the same time

the resource usage is only two-thirds of similar design.