Most secure messenger?

David Chaum Elixxer net boasts this ... 

    https://techraptor.net/technology/news/encryption-expert-proposes-backdoor-c...     "Chaum has devised a system which he believes will allow governments to decrypt communications of criminals without allowing mass surveillance. "     fucking hilarious ..." ETH be not proud. Last time I saw him on TV he looked close to dETH too.