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Based on Delerablee's identity-based broadcast encryption scheme (IBBE), we propose a new efficient dynamic identity-based broadcast encryption scheme (DIBBE), and prove its security in the Random Oracle model. The proposed scheme need not to setup a max potential receivers set in advance, and it has constant size of the public key, private key and header of cipertext. We also compare the performance of our scheme with the Delerablee's, the cost to decrypt in our revised scheme is also a constant size. So our scheme is efficient and practical for large receivers.