By Robert H. Deng, Jian Weng, Shengli Liu, Kefei Chen (auth.), Matthew K. Franklin, Lucas Chi Kwong Hui, Duncan S. Wong (eds.)
This ebook constitutes the refereed lawsuits of the seventh foreign convention on Cryptology and community defense, CANS 2008, held in Hong-Kong, China, in December 2008.
The 27 revised complete papers awarded have been conscientiously reviewed and chosen from seventy three submissions. The papers are equipped in topical sections on cryptosystems, signatures, id, authentication and key administration, cryptographic algorithms and protocols, movement ciphers and block ciphers, cryptographic foundations, purposes and implementations, in addition to safeguard in advert hoc networks and instant sensor networks.
Read or Download Cryptology and Network Security: 7th International Conference, CANS 2008, Hong-Kong, China, December 2-4, 2008. Proceedings PDF
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Extra info for Cryptology and Network Security: 7th International Conference, CANS 2008, Hong-Kong, China, December 2-4, 2008. Proceedings
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The challenger does the following. α ← ZZ q S01 α1 , α2 ← ZZ q ✿✿✿✿✿✿✿✿ S02 sk ← (α1 , α2 ) sk ←α ✿✿✿✿✿✿ ← (c ← g1α ) S03 pk ← (c ← g1α1 g2α2 ) pk ✿✿✿✿✿✿✿✿✿✿✿✿✿ S04 Send the public key pk to Alice r1 } S05 rˆ1 ← ZZ q , rˆ2 ← ZZ q \ {ˆ ˆ2 ← g2rˆ2 S06 u ˆ1 ← g1rˆ1 , u 1 α2 S07 vˆ ← u ˆα ˆ2 vˆ ← G 1 u ✿✿✿✿✿✿ ˆ κ S08 (K, ˆ ) ← kdf(ˆ v) Query phase 1. Alice adaptively issues decryption queries (u1 , u2 , e, t). The challenger does the following. ver(κ; e, t) = ⊥ then return ⊥ D08 Return ⊥. dec(K; e) ˆ 1 .
The encryption and decryption cost are the computational cost for each device to compute a header and session key, respectively. Related Work. Boneh, Gentry, and Waters proposed a bilinear map based scheme (BGW05) [7]. This is the first scheme to achieve constant hdr size regardless of the number of revoked users and fully collusion resistant that means the scheme is secure against a collusion of all users. In this scheme, ek, dk, and hdr size for total users n are O(n), O(n),1 and O(1), respectively.
Ek in DPP07 consists of label labi = (ui ∈ Z∗p , Bi ∈ G2 , Vi ∈ GT ) for i = 1, . . , n in addition to W ∈ G1 , H ∈ G2 and V ∈ GT , and hence 3n + 3 elements in total. On the other hand, ek in Scheme1 consists of (ui ∈ Z∗p , Bi ∈ G2 ) for each user i in addition to u0 ∈ Z∗p , W, A0 ∈ G1 and H, H0 ∈ G2 , so 2n + 5 elements in total, and it is smaller than DPP07 if n > 2. This is since our modification to Encrypt algorithm makes Vi s unnecessary. 40 M. Kusakawa et al. Note that, the above comparison only considers the number of elements included in ek.