Efficient Reverse Converters for 4-Moduli Sets {2 $$^{2n-1}-1$$ 2 n - 1 - 1 , 2 $$^{n}$$ n , 2 $$^{n}+1$$ n + 1 , 2 $$^{n}-1$$ n - 1 } and {2 $$^{2n-1}$$ 2 n - 1 , 2 $$^{2n-1}-1$$ 2 n - 1 - 1 , 2 $$^{n}+1$$ n + 1 , 2 $$^{n}-1$$ n - 1 } Based on CRTs Algorithm