South Korean investigators say they have reported that North Korea is using cyberattacks . Reports say the North is investing heavily in digital warfare . an attack on civilians in South Korea caused about $ 820 million worth of damage , a report denied .
South Korean investigators say they have proof that North Korea is launching cyberattacks . Reports say the North is investing heavily in digital warfare . December attack on banks in South Korea caused about $ 820 million worth of damage , a report says .