New answers tagged classical-cipher
2
The only way I'd change it is to make it explicit that $k$ is sampled from that set rather than is equal to it and to note that the key is used cyclically:
\begin{eqnarray*}
\mathrm{Gen}:&&k\leftarrow \{0,\ldots,25\}^t\\
\mathrm{Enc}:&&c_i=p_i+k_{i\pmod t}\pmod{26}\\
\mathrm{Dec}:&&p_i=c_i-k_{i\pmod t}\pmod{26}
\end{eqnarray*}
Top 50 recent answers are included