14/WAKU2-MESSAGE: Investigate the use of a message format with better features regarding unlinkability

[jimstir]

Reference Issue: vacp2p/rfc#182
Author: kdeme

Problem

There might be ways to link a message to a specific application, or worse user, because of the way the message is formed.

One specific case is for example, always having a specific size. Others might/will apply, tbi.

Waku v1 envelope data format e.g. always adds padding so that the messages become a mutiple of 256 bytes.

Acceptance criteria

• Review existing solutions, suggest what is applicable.

Details

This should be further investigated, started by looking at the current (best) practises in privacy focused transports (e.g. mixnets)

Possible Solutions

• ...

Notes

Sphinx format used by Nym and Lightning Network: https://cypherpunks.ca/~iang/pubs/Sphinx_Oakland09.pdf