code: @Override
      public Object get(String key) throws CredentialDestroyedException, CredentialExpiredException {
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) {
              sm.checkPermission(APP_READ_PERMISSION);
          }
          if (key.startsWith("wssecurity")) {
              if (sm != null) {
                  sm.checkPermission(READ_PERMISSION);
              }
          }
          return hashTable.get(key);
      }
docs: {@inheritDoc}