By Sarah N. Lynch WASHINGTON (Reuters) – U.S. securities regulators have unveiled a road map that lays out how they plan to make sure Wall Street firms are prepared to detect and prevent cyber security attacks. The SEC also plans examinations of more than 50 firms that will focus on cyber security-specific issues. The document’s release comes several months after Jane Jarcho, an associate director in the SEC’s investment adviser examination program, announced in a speech the agency planned to scrutinize whether firms have policies to prevent cyber attacks. The SEC subsequently followed up with a March 26 roundtable where experts debated how public companies, brokerages, asset managers and exchanges can protect themselves from cyber threats, and what role the U.S. government should play to ensure such attacks are adequately disclosed.