Abstract
Broadcast encryption schemes allow a center to transmit encrypted data over a broadcast channel to a large number of users such that only a select subset of privileged users can decrypt it. In this paper, we analyze how RSA accumulators can be used as a tool in this area. First, we describe a technique for achieving full key derivability given any broadcast encryption scheme in the general subset-cover framework [16]. Second, we show that Asano’s Broadcast Encryption scheme [5], can be viewed as a special-case instantiation of our general technique. Third, we use our technique to develop a new stateless-receiver broadcast encryption scheme that is a direct improvement on Asano’s scheme with respect to communication complexity, amount of tamper-resistant storage needed, and key derivation costs. Fourth, we derive a new lower bound that characterizes the tradeoffs inherent in broadcast encryption schemes which use our key derivability technique.
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Gentry, C., Ramzan, Z. (2004). RSA Accumulator Based Broadcast Encryption. In: Zhang, K., Zheng, Y. (eds) Information Security. ISC 2004. Lecture Notes in Computer Science, vol 3225. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30144-8_7
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DOI: https://doi.org/10.1007/978-3-540-30144-8_7
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