Function encryptMessage

src/gamesbyexample/railfencecipher.py:94–115

(message, key)

def encryptMessage(message, key):
    rails = getBlankRails(message, key)
    railCoordinates = getRailCoordinates(message, key)

    # Lay out the letters in rails:
    messageIndex = 0
    for x, y in railCoordinates:
        rails[x][y] = message[messageIndex]
        messageIndex += 1

    # Read the letters going across the rails:
    encryptedText = ''
    for railNumber in range(key):
        for x, y in railCoordinates:
            if y == railNumber:
                encryptedText += rails[x][y]

    # Show the encrypted message to the user:
    displayRails(rails)
    print('The encrypted message (not including the right-side bar) is:')
    print(encryptedText + '|')
    copyIfPossible(encryptedText)


def decryptMessage(message, key):