* <li>Configurable encryption algorithms (default: Blowfish)</li>
 * <li>Proper charset handling for key generation (UTF-8 by default)</li>
 * <li>Base64 encoding for text operations</li>
 * </ul>
 * <p>
 * <strong>Security Considerations:</strong>
 * </p>
 * <ul>
 * <li>Default Blowfish algorithm is suitable for general-purpose encryption</li>

 *   <li>reportActiveExternalHost: The external IP address to report in active mode.</li>
 *   <li>useEPSVwithIPv4: Whether to use EPSV with IPv4.</li>
 *   <li>isImplicit: Whether to use implicit SSL/TLS encryption.</li>
 *   <li>trustManager: The trust manager to use for SSL/TLS connections ("all", "valid", or "none").</li>
 *   <li>enterLocalPassiveMode: Whether to enter local passive mode.</li>

    /**
     * The key for user roles in the request attribute.
     */
    protected static final String USER_ROLES = "userRoles";

    /**
     * The cached cipher for encryption and decryption.
     */
    protected CachedCipher cipher;

    /**
     * The separator for values in the role string.
     */
    protected String valueSeparator = "\n";

    /**

search_engine.password=
# Interval (ms) for heartbeat checks to the search engine.
search_engine.heartbeat_interval=10000

# Cipher algorithm used for encryption.
app.cipher.algorism=aes
# Secret key for encryption (change this value for production).
app.cipher.key=___change__me___
# Algorithm for digest calculation.
app.digest.algorism=sha256
# Regex pattern for properties to encrypt.

      <match value="0x3080" type="string"
              mask="0xFFF8" offset="0">
         <!-- SHA with RSA Encryption -->
         <match value="0x300d06092a864886f70d01010b0500" type="string"
                 mask="0xFFFFFFFFFFFFFFFFFFFFFFFF00FFFF" offset="10:50" />
         <!-- SHA with DSA Encryption -->
         <match value="0x300b0609608648016503040301" type="string"

     * comment: Cipher algorithm used for encryption.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAppCipherAlgorism();

    /**
     * Get the value for the key 'app.cipher.key'. <br>
     * The value is, e.g. ___change__me___ <br>
     * comment: Secret key for encryption (change this value for production).