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If you have the bandwidth to do so, and good communication reliability between the nodes, you can perform a multi-party Diffie Hellman key exchange. The most efficient way to do so would be using X25519, resulting in a shared 256-bit secret between all parties. This can then be used to derive keys and other secret values. This would also allow new nodes to ...


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This question in a re-post of this question on security.SE. For completeness, I'll re-post my answer here. Let's break down the problem into two parts: The first problem is that you want something that looks random to an outside attacker (ie is unpredictable), but can be computed by anybody in the know. That sounds a lot like a Cryptographically secure ...


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The way to do this would be to use some publicly available random source. For example, if the nodes in the P2P network can be preprogrammed with 50 stock symbols, you could use the ending price of the 50 stocks each day to generate the next day's secret. Another option would be to use some information in a block of the bitcoin block chain. For example, here ...



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