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Two new ID-based conference key broadcast systems are proposed. The conference key can be distributed knowing only the receivers' identities. Only one copy of the ciphertexts is required to broadcast to all users. The security of these new schemes is based on the difficulty of factorisation as well as computing the discrete logarithm. We investigate their security and give a comparison to a recently proposed scheme.
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Hwang et al. (1994) studied this question.
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