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