The oddity of the legislation is that it focuses on what many in the cyberworld consider to be a diminishing form of defense: collecting and sharing those “signatures,” which the Department of Homeland Security and the F.B.I. periodically circulate to a select list of major corporations. Most sophisticated cyberattackers have figured that out. “I think the fruits of detecting signatures and patterns of broad attacks are already picked,” said Jonathan Zittrain, a Harvard law professor. “The biggest threats,” he said, are far more customized, “with elements of social engineering or betrayal of an employee with access to data or code.”

Source: Senate Approves Cybersecurity Bill Despite Flaws – The New York Times