By Robert H. Deng, Jian Weng, Shengli Liu, Kefei Chen (auth.), Matthew K. Franklin, Lucas Chi Kwong Hui, Duncan S. Wong (eds.)
This publication constitutes the refereed court cases of the seventh foreign convention on Cryptology and community safety, CANS 2008, held in Hong-Kong, China, in December 2008.
The 27 revised complete papers provided have been conscientiously reviewed and chosen from seventy three submissions. The papers are prepared in topical sections on cryptosystems, signatures, identity, authentication and key administration, cryptographic algorithms and protocols, circulate ciphers and block ciphers, cryptographic foundations, functions and implementations, in addition to safety in advert hoc networks and instant sensor networks.
Read Online or Download Cryptology and Network Security: 7th International Conference, CANS 2008, Hong-Kong, China, December 2-4, 2008. Proceedings PDF
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Example text
Otherwise, it computes Pl (l = 1, . . , r) using Aggregate algorithm [9] which we describe below. Then, the Encrypt algorithm derives γPr = 1 Pr−1 − uRr Pr ∈ G2 and K = e(A0 , γPr + u0 Pr ) = e(G, H0 ) hr (γ) ∈ GT . After that, it also computes the session key K = (K )k ∈ GT and sets a header as hdr = (kW, kPr , (uR1 , P1 ), . . , (uRr , Pr )). The output of this algorithm is (hdr, K). 36 M. Kusakawa et al. Aggregate((uR1 , BR1 ), . . , (uRr , BRr )) [9]: Let P0,l = BRl (l = 1, . . r). For all (j, l) such that j = 1, .
We consider that Scheme2 is the first scheme that achieves provably secure authenticated dynamic broadcast encryption. 34 2 M. Kusakawa et al. Efficient Dynamic Broadcast Encryption (DBE) In this section, we briefly review properties of bilinear maps at first, then we propose an efficient dynamic broadcast encryption scheme (Scheme1), where we adapt two modifications to DPP07. As a result, we can reduce encryption cost and eliminate n elements of the encryption key (ek). The first trick changes the way to compute an intermediate value over GT which is used to derive a session key in encryption algorithm.
If the received query is ‘uncorrupt’, B assigns an unique value uj for the uncorrupt user j, generates the public information Bj for the user j, returns (uj , Bj ), and updates ek. Query Phase 1: A adaptively issues decryption queries DQ = (hdr, ul ) ( = 1, . . , z) where ul and hdr denote an unique value assigned for user l and an arbitrary header hdr, respectively. B returns the output of Decrypt(hdr, dkl ). Challenge Phase: B generates (hdr∗ , K ∗ ) ← Encrypt(ek, S ∗ ). Then, B selects b ∈R {0, 1}, sets Kb = K ∗ and K1−b ∈R KS where KS denotes the space of session keys.
