(Bloomberg) -- In a deal that puts a spotlight on the shadowy world of cyberwarfare, Jacobs Engineering Group Inc. agreed to acquire KeyW Holding Corp. for about $603 million, increasing its number of employees with top-secret government access by 50 percent. Jacobs, a Dallas-based engineering firm with more than 80,000 employees, already gets about 23 percent of its $15 billion in annual revenue from the U.S. government. Along with protecting information for the government, KeyW’s website promises to help clients design “offensive cyberspace operations” and training for “cyber missions.” The Hanover, Maryland-based company, with 1,790 employees, also helps governments collect intelligence data via aircraft and satellites. Jacobs will pay $11.25 in cash for each share of KeyW, a 43 percent premium over the company’s share price at the end of last week. KeyW rose as much as 43 percent, the most ever, to $11.23. Jacobs rose less than 1 percent to $77.65 at 11:10 a.m. in New York.