SBOX is the most time consuming part in block cipher SM4algorithm

so its of great importance to construct a S box of high performance.In order to reduce latency of encryption algorithms in SM4

We introduce the N-dimensional hypercube method to construct SBOX

the delay reduced six percent and the area reduced seventeen percent Compared with the traditional S box using look-up table method.whats more

this method is portable that it can apply to SBOX transformations of other algorithms.