Criptografar arquivo

import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class Decrypt {
    String key;
    String encoded;
    Decrypt(String encoded, String key) {
        this.key     = key;
        this.encoded = encoded;
    }
    DecryptedInfo decrypt() throws Exception {
        byte [] toDecode = encoded.getBytes();
        Provider sunJce = new com.sun.crypto.provider.SunJCE();
        Security.addProvider(sunJce);
        SecretKeyFactory keyFac;
        Cipher           cipher;
        SecretKey        secretKey;
        DESKeySpec       keySpec;
        keySpec   = new DESKeySpec(key.getBytes());
        keyFac    = SecretKeyFactory.getInstance("DES");
        secretKey = keyFac.generateSecret(keySpec);
        cipher    = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        String    decoded = new String(cipher.doFinal(toDecode));
    }
}