Day63:)wanna cry 电脑勒索病毒

These days,a ransomware identified as wanna cry has effected 99 countries and thousands of Internet users have fallen victim to this massive cyber attack.Their important documents are locked and encrypted and they can't get them back unless they pay many bitcoins. The fourth year university students are affected severely for their graduation dissertations are locked.Some universities have issued notice that students should install specific software patch for security holes as well as update and backup systems.