Chinese hackers have had access to emails of top U.S. officials, NBC News reports. Official: Chinese also garnered the email address books of targeted officials, reconstructing and then “exploiting [their] social networks” Security experts say the content of private emails could be as important as that found in official correspondence. Private emails could contain information that could be used to blackmail the official – “think of something of a sexual [nature] or that could be very embarrassing””]
Source: https://www.cuinfosecurity.com/report-china-spies-on-private-emails-a-8466

