How the Kremlin has targeted Signal app at heart of White House group chat leakJames TitcombTelegraph Media Group Holdings LtdToday at 12:04Russian military hackers have targeted the messaging app at the centre of the White House group chat fiasco, raising further fears about the security of US secret communications.Researchers at Google found cyber attackers linked to the Kremlins military intelligence agency had sought to gain access to Signal accounts in Ukraine and were likely to use the techniques on other targets to snoop on conversations.