inver = InvertibleCryptographer.createBlowfishCipher(fessConfig.getAppCipherKey());
        } else if ("des".equalsIgnoreCase(cipherAlgorism)) {
            inver = InvertibleCryptographer.createDesCipher(fessConfig.getAppCipherKey());
        } else if ("rsa".equalsIgnoreCase(cipherAlgorism)) {
            inver = InvertibleCryptographer.createRsaCipher(fessConfig.getAppCipherKey());
        } else {

     * comment: Secret key for encryption (change this value for production).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAppCipherKey();

    /**
     * Get the value for the key 'app.digest.algorism'. <br>
     * The value is, e.g. sha256 <br>
     * comment: Algorithm for digest calculation.