49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
# Project : Substitution Cipher
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plaintext = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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ciphertext = "ZEBRASCDFGHIJKLMNOPQTUVWXY"
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test = "flee at once. we are discovered!"
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encrypt = "SIAA ZQ LKBA. VA ZOA RFPBLUAOAR!"
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see "Plaintext : " + plaintext + nl
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see "Ciphertext : " + ciphertext + nl
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see "Test : " + test + nl
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see "Encoded : "
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encodetext = encode(test)
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see encodetext + nl
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see "Decoded : "
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decodetext = decode(encodetext)
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see decodetext + nl
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func encode(test)
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str = ""
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for n = 1 to len(test)
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pos = substr(plaintext, upper(test[n]))
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if test[n] = " "
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str = str + " "
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elseif test[n] = "!"
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str = str + "!"
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elseif test[n] = "."
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str = str + "."
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else
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str = str + substr(ciphertext, pos, 1)
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ok
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next
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return str
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func decode(test)
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str = ""
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for n = 1 to len(encodetext)
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pos = substr(ciphertext, upper(encodetext[n]))
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if test[n] = " "
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str = str + " "
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elseif test[n] = "!"
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str = str + "!"
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elseif test[n] = "."
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str = str + "."
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else
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str = str + lower(substr(plaintext, pos, 1))
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ok
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next
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return str
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