Abstract
Broadcast encryption (BE) is a one to many encryption protocol which sends a message to desired set of users securely and efficiently. Broadcast encryption with personalized messages (BEPMsg) is a cryptographic primitive that sends a common broadcast message together with user-specific personalized messages to a group of users. This work contains the transformation of broadcast encryption from the bilinear map to broadcast encryption with personalized messages. The transformation of BE from bilinear map to BEPMsg helps to design BEPMsg with different flavors. We have also proposed two BEPMsg constructions and discussed their security. Our first construction is an adaptive secure BEPMsg scheme. It also supports inclusive–exclusive property in encryption algorithm as the broadcaster can select the set of subscribed or revoked users to decrease the encryption cost depending on the size of the set of subscribed and revoked users. More positively, it has a constant header size. Our second construction provides outsider anonymity in BEPMsg by performing the decryption without using the set of subscribed or revoked users.
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