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by modalduality
3213 days ago
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yup! they should have used a commitment scheme instead - for example, SHA256(winning numbers || 512-bit nonce). To reveal, reveal the winning numbers and the nonce and Mr X can check that the hash matches. The nonce is to introduce more entropy so Mr X can't just bruteforce the hash, but since finding any collision is difficult, it doesn't let the alien cheat by trying different nonces (unlike with different keys with encryption schemes). |
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