"/home/yossef/notes/personal/hashing/vigenere_cipher.md"

path: personal/hashing/vigenere_cipher.md

- **fileName**: vigenere_cipher
- **Created on**: 2025-03-21 00:24:38

-> ((p + k) % 26) this the formal for vigenree cipher encryption

vigenere cipher example ;)

# starting creating a vigenere cipher
def encryption(plain_text: str, key: int) -> str:
    """
    function for implementing a encryption for plain text using key 
    -> ((p + k) % 26) this the formal for encryption
    p: is the char after converted to a ascii representation
    k: is the key for that adding to text
    % 26: to check if out of bounds
    """
        
    encrypt_text = ""

    # itration for all char in text
    for i in range(len(plain_text)):
        ## starting by convert the char to number ASCII TABLE
        # for more information:
        # [[???]]
        # why subtraction by a to make a range for x ascii numbers between
        # 0 to 26
        x = ord(plain_text[i]) - ord('a')
        x = (x + key) % 26 # apply formal
        encrypt_text += chr(x) # convert ot char

    return encrypt_text

def main():
    plain_text = "yossef"
    print(encryption(plain_text=plain_text, key=8))

if __name__ == "__main__":
    main()

continue:./vigenere_cipher2.md
before:./hill_cipher.md