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Amazon threatens to cut off Signal encrypted chat

Graffiti reading "Use Signal" above an anarchy symbol.
Signal is a favorite app of dissidents and protestors worldwide, as seen in a 2017 Berkeley, Calif. protest. Photo: Elijah Nouvelag via Getty

The encrypted messaging app Signal said Tuesday it had been threatened by Amazon's cloud division after disguising Signal traffic as an Amazon site.

Why it matters: The Signal app, like most apps, used a trick called "domain fronting" to circumvent censorship measures by countries like Iran. Amazon banned domain fronting on Friday, leaving Signal and countless protesters worldwide in the lurch.