For the security transmission of artificial noise with finite alphabet inputs in secure spatial modulation system. an antenna selection algorithm based on cut-off rate (COR) was proposed. Considering that it was difficult to obtain the closed-form expression of the secrecy rate. the problem of maximizing the secrecy rate into that of maximizing the COR was converted by the algorithm. https://balboasurfandsstylers.shop/product-category/womens-bucket-hats/