Most major security blunders don’t affect the company’s stock price for long, a researcher reported this week. In fact, investors may be able to use the rebound to make money. Kenneth Belva, who runs a security consulting company on the side and is an information security officer for Credit Industriel et Commercial in New York during the day, analyzed several prominent data breaches in 2004 and 2005 by comparing the negative press of the incident with the movement of the firm’s stock price. “Why is it the case that information security incidents do not appear to have a greater impact on both investor confidence as well as the public at large?” asked Belva this week as he presented his research at the FiTech Summit on Long Island, N.Y. “If 40 million customer credit card numbers are exposed in a security breach at the credit card processor CardSystems, why do a significant number people not cancel their Visa and/or Mastercard?”