1) A classified attribution involving intelligence collection. It could be anything from corrupted foreign officials to hacking
2) A law enforcement investigation would ideally be built upon a collection of circumstantial evidence combined with mistakes by the hacker. In the case of Russia, one of their hackers forgot to log into the VPN before logging into the Guccifer social media account.
2) A law enforcement investigation would ideally be built upon a collection of circumstantial evidence combined with mistakes by the hacker. In the case of Russia, one of their hackers forgot to log into the VPN before logging into the Guccifer social media account.