Question

Encrypt the message You should be aware that encrypted communications are illegal in some parts of the world. using a polyalphabetic cipher that alternates the use of the three affine ciphers $$ \begin{aligned} & f(x)=11 x+2 \bmod 26 \\ & g(x)=15 x+5 \bmod 26 \\ & h(x)=19 x+7 \bmod 26 \end{aligned} $$

    Encrypt the message
You should be aware that encrypted communications are illegal in some parts of the world.
using a polyalphabetic cipher that alternates the use of the three affine ciphers
$$
\begin{aligned}
& f(x)=11 x+2 \bmod 26 \\
& g(x)=15 x+5 \bmod 26 \\
& h(x)=19 x+7 \bmod 26
\end{aligned}
$$

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Applied Algebra: Codes, Ciphers and Discrete Algorithms

Applied Algebra: Codes, Ciphers and Discrete Algorithms

Darel W. Hardy, Fred… 2nd Edition

Chapter 4, Problem 11

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Step 1

.., Z=25. Ignore spaces and punctuation. The message "You should be aware that encrypted communications are illegal in some parts of the world" becomes: \[ \text{Y: 24, o: 14, u: 20, s: 18, h: 7, o: 14, u: 20, l: 11, d: 3, b: 1, e: 4, a: 0, w: 22, a: 0, r: 17, e: Show more…

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Encrypt the message You should be aware that encrypted communications are illegal in some parts of the world. using a polyalphabetic cipher that alternates the use of the three affine ciphers $$ \begin{aligned} & f(x)=11 x+2 \bmod 26 \\ & g(x)=15 x+5 \bmod 26 \\ & h(x)=19 x+7 \bmod 26 \end{aligned} $$

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