31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
const leftalphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
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const rightalphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
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function chacocoding(text, encoding, verbose=false)
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left, right = Vector{Char}(leftalphabet), Vector{Char}(rightalphabet)
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len, coded = length(text), similar(Vector{Char}(text))
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for i in 1:len
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verbose && println(String(left), " ", String(right))
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n = indexin(text[i], encoding ? right : left)[1]
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coded[i] = encoding ? left[n] : right[n]
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if i < len
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left .= circshift(left, -n + 1)
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left[2:14] .= circshift(left[2:14], -1)
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right .= circshift(right, -n)
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right[3:14] .= circshift(right[3:14], -1)
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end
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end
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String(coded)
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end
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function testchacocipher(txt)
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println("The original plaintext is: $txt")
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println("\nThe left and right alphabets for each character during encryption are:")
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encoded = chacocoding(txt, true, true)
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println("\nThe encoded ciphertext is: $encoded")
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decoded = chacocoding(encoded, false)
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println("\nDecoded, the recovered plaintext is: $decoded")
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end
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testchacocipher("WELLDONEISBETTERTHANWELLSAID")
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