Created
April 7, 2023 10:14
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# Array get cycle | |
# KEY cyclical enumerator | |
KEY = "code" | |
SYMBOLS = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z","1","2","3"] | |
def encrypt(input_text) | |
crypt input_text, false | |
end | |
def decrypt(input_text) | |
crypt input_text, true | |
end | |
def crypt(input_text, decrypt) | |
key_idx = -1 | |
input_text.chars.map do |letter| | |
if letter == " " | |
letter | |
else | |
key_idx += 1 | |
draaing = decrypt ? -key_index(key_idx) : key_index(key_idx) | |
letter_mepper letter, draaing | |
end | |
end.join | |
end | |
def key_index offset | |
SYMBOLS.find_index(key_letter(offset)) | |
end | |
def key_letter offset | |
KEY[offset % KEY.length] | |
end | |
def letter_mepper(input_symbol, draaing) | |
new_index = SYMBOLS.find_index(input_symbol) + draaing | |
SYMBOLS[new_index % SYMBOLS.length] | |
end | |
input = "jij hebt dit voor helemaal niks ontcijferd" | |
ciphertext = encrypt(input) | |
puts "'#{input}' encrypted is '#{ciphertext}'" | |
decrypted = decrypt(ciphertext) | |
puts "'#{ciphertext}' decrypted is '#{decrypted}'" |
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De Caesar en-/decryptor van Brecht uit de Feynmanklas!