Security of the Center in Key
نویسندگان
چکیده
This paper studies the security of the trusted center in a b-secure t-group key distribution scheme in which the center issues a private information vi 2 V to each user i based on the center secret s 2 S. User i can obtain the common key k 2 K with t ? 1 other users from vi so that any dishonest b users cannot learn any key they should not know. First, we show how to distribute the power of the center to m centers so that, even if l ? 1 centers and b users collaborate, they cannot learn any key that b users should not know. Next, we prove that log 2 jSj b + t t log 2 jKj.
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