Indian Statistical Institute
Broadcast Encryption (BE) deals with the problem of broadcasting encrypted data. For each transmission (or session), there is a set of privileged users who should be able to decrypt the data and a set of revoked users who should not be able to do so. In symmetric key BE, there is a center which initially distributes keys to all the users and also broadcasts the encrypted data in each session. In each session, the data to be broadcast is encrypted with a random session key using a symmetric key encryption algorithm.