Playfair cipher: Difference between revisions

Line 1,108:

function canonical(s)

s = replace(replace(uppercase(s), from => to), r"[^A-Z]" => "")

a = [c for c in s]

a, dupcount = [c for c in s], 0

b = deepcopy(a)

for i in 1:2:length(a)-1

if a[i] == a[i + 1]

~~a[i~~ + 1~~] =~~ 'X'

splice!(b, i+1+dupcount:i+dupcount, 'X')

dupcount += 1

end

s = String(a)

s = String(b)

return isodd(length(s)) ? s * "X" : s

end

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# Translate key into an encoding 5x5 translation matrix.

keyletters = unique([c for c in canonical(key * "ABCDEFGHIJKLMNOPQRSTUVWXYZ")])

m = reshape(keyletters[1:25], 5, 5)

m = Char.((reshape(UInt8.(keyletters[1:25]), 5, 5)'))

# encod is a dictionary of letter pairs for encoding.

encod = Dict()

# Map pairs in same row of matrix m.

for i in 1:5, j in 1:5, k in 1:5

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<pre>

Original: Hide the gold in...the TREESTUMP!!!

Encoded: MB OD BZ DX AN EB UK MD IU XM ZK RZ IY

Encoded: BM OD ZB XD NA BE KU DM UI XM MO UV IF

Decoded: HI DE TH EG OL DI NT HE TR EX ST UM PX

Decoded: HI DE TH EG OL DI NT HE TR EX ES TU MP

</pre>