David Kleidermacher has been appointed chief security officer of BlackBerry Ltd., the company announced Tuesday. Kleidermacher was previously chief technology officer at Green Hills Software, a maker of embedded operating systems, according to a press release. He has more than 20 years of experience in strategy and product engineering, the company said, and is the author of a book on security for embedded systems. “David’s knowledge of securing the Internet of Things and embedded systems will be invaluable as we execute on our strategy and continue to expand our management...