谢礼立同志的讨论提出了作者原文中未详细说明之处和一些值得讨论的问题,使作者有机会进一步对原文进行解释和补充。希望这一讨论能够对局部加密傅里叶谱的计算分析起推进作用。一、讨论建议在 ZOOMFT 基本步骤中增加一个第四步,将在低频中加密了的傅里叶谱再还原到高频中来,这自然是对的。原文中是将这一步与第三步合并在一起,但原文中图 Comrade Xie Lili’s discussion raised some issues that were not described in detail in the author’s original text and some issues worth discussing, giving the author an opportunity to further explain and supplement the original text. It is hoped that this discussion can promote the computational analysis of the local-encryption Fourier spectrum. I. Discussion It is natural to add a fourth step to the ZOOMFT basic steps to restore the Fourier spectrum encrypted at low frequencies to high frequencies. The original text merges this step with the third step, but the original picture