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The authors consider designing broadcast encryption schemes with constant-size secret keys and ciphertexts, achieving chosen-ciphertext security. They first argue that known CPA-to-CCA transforms currently do not yield such schemes. They then propose a scheme, modifying a previous selective CPA secure proposal by Boneh, Gentry, and Waters. Their proposed scheme has constant-size secret keys and ciphertexts and they prove that it is selective chosen-ciphertext secure based on standard assumptions. Their scheme has ciphertexts that are shorter than those of the previous CCA secure proposals. Then they propose a second scheme that provides the functionality of both broadcast encryption and revocation schemes simultaneously using the same set of parameters.
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