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zeekayandHanzo Dev
019248c82a
A committee of n members at threshold t decrypts without any member holding the key. Keygen is dealerless: each member samples its own contribution and publishes a share of the collective public key. Decrypt combines masked partial decryptions, bound by digest to the ciphertext, and never reconstructs the key. Recombination uses the integer Lagrange coefficients directly and clears no denominator, so quorums whose coefficients are not integers are refused rather than answered wrongly. Decrypt searches the contributions on hand for one that recombines exactly; the largest positions always do. Custody and correctness are proved in lux/proofs/fhe/threshold-custody.tex. Co-authored-by: Hanzo Dev <[email protected]>