Hacker “OxOmar,” dubbed the “Saudi Hacker,” struck again on Monday, this time shutting down the El Al and Tel Aviv Stock Exchange information site. The cyber attack did not affect the site on which investors trade stocks, and trading was not affected. The hacker struck last month by invading thousands of accounts of Israeli credit card holders. The El Al site was shut down as of mid-morning, and the Stock Exchange site was available but not operable. OxOmar blocked the El Al site but did not take control of it or damage its content. The real damage is to the...