The TJX credit-card data breach -- the largest ever -- was sort of amazing, in that it went on for a few years before it was detected and disclosed. It was established at the outset that the company didn't comply with credit-card companies' strict security guidelines, but a story in today's Wall Street Journal spells out the depths of TJX's incompetence when it came to security. Investigators believe that the hackers used directional antennas to intercept signals sent over the WiFi networks at the company's stores, which were encrypted only with the easily cracked WEP standard, since TJX never bothered...