java - key exchange algorithm with optional parties -


i need generate secret key (or password) agreement of multiple parties out of parties optional.

for example, mr. a, b, c & d members can agreement , out of atleast 2 agreements required generate secret. secret should same such key agreements.

i went through diffie-hellman algorithm requires keys. looking @ 1 private key , n public key type of key exchange algorithm.

please suggest algorithms have behavior.

all public key cryptosystems know of uses 1-1 key relationship. it's not possible standard algorithms available.

what looking threshold cryptosystem or shamir's secret sharing.


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