"/home/yossef/notes/courses/hashing/caeser_cipher.md"

path: courses/hashing/caeser_cipher.md

- **fileName**: caeser_cipher
- **Created on**: 2025-02-27 23:24:46

# chr convert the number to char for exmpale chr(65) => A
# ord is the reverse of chr convert char to number ord(A) => 65
# so now this work by shifting each ch in text by specific number
# like a => 26 after shifting 3 times 26 + 3 = 27 => d

def encrypted_data(plain_text, key):
    """
    so this function it's implementation for ceaser cipher hashing
    - plain_text(string) => param for text that want to change
    - key(int) => param for the number of shifting want to do
    @reutrn new hashing text cipher_text(string)
    """
    cipher_text = "" # initlization the cipher_text
    for i in range(len(plain_text)):
        if i == " ": # if ch == space adding space to return hashing value
            cipher_text += " " 
        else:
            ch_value = ord(plain_text[i])+key # starting shifting
            # this mean is the letter is captal
            if ch_value > ord("z"):
                cipher_text += chr(ch_value - 26) # if captal value
            else:
                cipher_text += chr(ch_value) # if small value
    return cipher_text

print(encrypted_data("test", 2))
# output => vguv

# for decription the hashing it's only change in code
ch_value = ord(plain_text[i])-key 

continue:./transposition_cipher.md
before:./playfair_ceaser.md