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Re:Vuvuzela: Metadata-private messaging by eslaught on Tuesday February 05, 2019 @12:26PM (#19087373)
Personally, I found the research section more enlightening. It lists two papers which talk about their approach:

https://vuvuzela.io/research

Re:Vuvuzela: Metadata-private messaging by lazard on Tuesday February 05, 2019 @04:09PM (#19089847)
Thanks. I just added our latest paper to the list.