Obama signs security cyber-operations guidelines

President Barack Obama has signed a classified directive laying out new guidelines for cyber-operations that national security planners can use to protect U.S. computer networks from attack, a senior administration official said Wednesday.

“It continues to be our policy that we shall undertake the least action necessary to mitigate threats and that we will prioritize network defense and law enforcement as the preferred courses of action,” the official, who asked not to be named, said in an email.