The number that you choose to rotate your letters by is what we call in cryptography, a key.
你选择的旋转字母的数量,就是所谓的加密学,一个密钥。
You rotate the letters by a deterministic amount, by a fixed number of steps so that the end result is actually something that can be reversed.
你用确定的数量旋转那些字母,通过一个固定数量的步骤,这样,最终结果是可以把它,反加密出来。
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