The container format itself is really just a giant mathematical mess -- there really isn't anything to backdoor there.
The container itself can actually be 'backdoored' by a malicious client by eg saving a duplicate of the master key, or generating a master key using a deliberately weak RNG.
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The container itself can actually be 'backdoored' by a malicious client by eg saving a duplicate of the master key, or generating a master key using a deliberately weak RNG.