Communication Lower Bounds for Cryptographic Broadcast Protocols

ePrint Report: Communication Lower Bounds for Cryptographic Broadcast Protocols

Erica Blum, Elette Boyle, Ran Cohen, Chen-Da Liu-Zhang

Broadcast protocols enable a set of $n$ parties to agree on the input of a designated sender, even facing attacks by malicious parties. In the honest-majority setting, a fruitful line of work harnessed randomization and cryptography to achieve low-communication broadcast protocols with sub-quadratic total communication and with "balanced" sub-linear communication cost per party.


However, comparatively little is known in the dishonest-majority setting. Here, …

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