Generally, this problem is reduced to quadraticresidue problem of modulo a big prime number. But this reduction is not applicable to Optimal Extension Fields (OEF).
一般而言,该问题归结为模大素数的二次剩余问题,但这种归结不能用于最优扩域OEF。
3
The quadraticresidue theory was used for selecting randomly the embedding positions, and an extended coding scheme is utilizing for dynamically hiding secret messages.