Wireless broadcast encryption based on smart cards

Abstract

Wireless broadcasting is an efficient way to broadcast data to a large number of users. Some commercial applications of wireless broadcasting, such as satellite pay-TV, desire that only those users who have paid for the service can retrieve broadcast data. This is often achieved by broadcast encryption, which allows a station securely to broadcast data to a dynamically changing set of privileged users through open air. Most existing broadcast encryption schemes can only revoke a pre-specified number of users before system re-setup or require high computation, communication and storage overheads in receivers. In this paper, we propose a new broadcast encryption scheme based on smart cards. In our scheme, smart cards are used to prevent users from leaking secret keys. Additionally, once an illegally cloned smart card is captured, our scheme also allows tracing of the compromised smart card by which illegal smart cards are cloned, and can then revoke all cloned smart cards. The new features of our scheme include minimal computation needs of only a few modular multiplications in the smart card, and the capability to revoke up to any number of users in one revocation. Furthermore, our scheme is secure against both passive and active attacks and has better performance than other schemes.

Generic Constructions and Transformations of Decryption Consistent Encryption

“…Multi-receiver encryption has a lot of applications such as TV pays [3], wireless broadcasts [4], mobile devices [5], group communication systems [6] and smart cards [4].…”

Efficient and adaptively secure broadcast encryption systems

“…A broadcast encryption scheme is stateless, meaning all receivers cannot update their keys between sessions ; that is, the initialization stage is performed only once, and after the initialization step, all receivers have the information that is needed to decrypt future broadcast message. The typical examples on which broadcast encryption schemes are used are pay‐TV shows , multicast communication , content protection , and so on. For example, when a new user subscribes to a pay‐TV show, the user receives a set‐top box (STB) or a smartcard that contains the decryption key for decrypting the broadcasting program.…”

“…The typical examples on which broadcast encryption schemes are used are pay-TV shows [7], multicast communication [8], content protection [9], and so on. For example, when a new user subscribes to a pay-TV show, the user receives a set-top box (STB) or a smartcard that contains the decryption key for decrypting the broadcasting program.…”