Apple is protecting its iMessage chat service against future attacks using quantum computers that could undermine its current encryption techniques. Although it may be years before such attacks become possible, the iPhone manufacturer said at an announcement on Wednesday that action needed to be taken now. Apple fears attackers could try to tap into large quantities of securely encrypted communication and try to crack the protection later. The new protocol, called PQ3, is designed to secure messages sent against such attacks. Apple’s iMessage and other chat apps such as Signal and WhatsApp use…