Encrypt given data using seed cipher algo. SEED is a block cipher developed by South Korea's KISA, designed to provide secure encryption with a 128-bit block size and 128-bit key. SEED was created as a national standard for encryption in South Korea, offering security suitable for government and financial systems. SEED is considered secure but has been largely replaced by more widely used ciphers such as AES. Our encryption process prepends the IV string used during the encryption process in the encrypted data so that it can be used during decryption.