AES implementation

Advanced Encryption Algorithm (Rijndael)

• two-way process of encryption and decryption with the use of a key
• a sequence of characters serves as the key
• encrypting data to safely store it

AES standards:

• key lengths: 128, 192, 256 bits
• constant block size: 128 bits

Usage

class Main{
    public static void main(String[] args){
        byte[] data = "what".getBytes();
        byte[] password = "defense".getBytes();

        byte[] encryptedBytes = Encryption.encryptData(data, password);

        byte[] decryptedBytes = Decryption.decryptData(encryptedBytes, password);
        assert new String(decryptedBytes).startsWith("what");
    }
}

sources:

• https://formaestudio.com/rijndaelinspector/archivos/Rijndael_Animation_v4_eng-html5.html
• https://crypto.stackexchange.com/questions/2402/how-to-solve-mixcolumns