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Shift Cipher

Overview

$$\begin{gathered} by{z}_{26}Operation\; as\; an\; example,kFor\; the\; key \\ encryption:e_k(x)=(xk)mod26 \\ Decryption:d_k(x)=(x-k)mod26 \end{gathered}$$
In practice, we use$Z_{256}$Operation (addition of groups)

Code

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