Caesar Cipher
A basic Caesar Cipher class in PHP for fun and learning., (*1)
, (*2)
, (*3)
Installation
Install the package using Composer., (*4)
composer require kkiernan/caesar-cipher
Instantiation
Create a new CaesarCipher instance. Make sure to import the class or use the fully qualified class name., (*5)
$cipher = new KKiernan\CaesarCipher();
Available Methods
Encrypt
To encrypt a message, pass the CaesarCipher instance some plaintext and a key. In a Caesar Cipher, the key is just the number of places to shift each letter in the plaintext., (*6)
$ciphertext = $cipher->encrypt('This is a plain text message that will be encrypted!', 8);
Decrypt
To decrypt a ciphertext, use the decrypt method on the CaesarCipher instance. Pass in the ciphertext and the key that was used to encrypt the message., (*7)
$plaintext = $cipher->decrypt($ciphertext, 8);
Crack
You can attempt to crack an encrypted message by using the crack method, which will return a best guess for the key's value. Use the key to retrieve the plaintext., (*8)
$key = $cipher->crack('Max wtrl tkx zxmmbgz lahkm tztbg.');
$plaintext = $this->decrypt($ciphertext, $key);
Security
This was written for fun and learning very basic encryption techniques (like substitution in this case). Obviously Caesar Cipher is not a secure encryption algorithm (only 25 possible keys), so don't use this for anything sensitive. It's really a toy meant for fun., (*9)
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