ユーザー資格情報をソフトウェアに安全に保存するにはどうすればよいですか?

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

public class SecureCredentials {

    private static final char[] PASSWORD = "YourEncryptionKey".toCharArray();
    private static final byte[] SALT = {
        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12
    };

    public static void encrypt(char[] property) throws Exception {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));

        // Encrypt and save to temporary storage
        String encrypted = Base64.encodeBytes(pbeCipher.doFinal(property));

        // Cleanup data sources
        for (int i = 0; i < property.length; i++) {
            property[i] = 0;
        }
        property = null;
        System.gc();

        // Return encryption result
        return encrypted;
    }

    public static String decrypt(String property) throws Exception {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
        return new String(pbeCipher.doFinal(Base64.decode(property)));
    }

    // Usage example
    public static void main(String[] args) {
        try {
            char[] password = "MySecurePassword".toCharArray();
            String encryptedPassword = encrypt(password);
            String decryptedPassword = decrypt(encryptedPassword);

            System.out.println("Original Password: " + String.valueOf(password));
            System.out.println("Encrypted Password: " + encryptedPassword);
            System.out.println("Decrypted Password: " + decryptedPassword);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}