Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution. (arXiv:2206.09159v3 [quant-ph] UPDATED)

Byzantine agreement, the underlying core of blockchain, aims to make every
node in a decentralized network reach consensus. Classical Byzantine agreements
unavoidably face two major problems. One is $1/3$ fault-tolerance bound, which
means that the system to tolerate $f$ malicious players requires at least
$3f+1$ players. The other is the security loopholes from its classical
cryptography methods. Here, we propose a Byzantine agreement framework with
unconditional security to break this bound with nearly $1/2$ fault tolerance
due to multiparty correlation …

blockchain decentralized loopholes major malicious network node players problems quantum security solution system tolerance