The US government whistleblower Edward Snowden believes encryption might make it difficult or even impossible to distinguish signals from alien species from cosmic background radiation. On Friday night, Snowden appeared from Moscow on the astrophysicist and science communicator Neil deGrasse Tyson’s StarTalk podcast, via a robot video link called a “beam remote presence system”. Snowden said, as human and alien societies get more sophisticated and move from “open communications” to encrypted communication, the signals being broadcast will quickly stop looking like recognisable signals. Snowden said, alien messages would be so encrypted that it would render them unrecognisable, “indistinguishable to us from cosmic microwave background radiation”. In that case, humanity would not even realise it had received such communications. “Only,” Tyson replied jovially, “if they have the same security problems as us.”
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