Download Cryptology and Network Security: 7th International by Robert H. Deng, Jian Weng, Shengli Liu, Kefei Chen (auth.), PDF

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 offered have been conscientiously reviewed and chosen from seventy three submissions. The papers are equipped in topical sections on cryptosystems, signatures, identity, authentication and key administration, cryptographic algorithms and protocols, circulation ciphers and block ciphers, cryptographic foundations, functions and implementations, in addition to defense in advert hoc networks and instant sensor networks.

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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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Dec: Given a ciphertext (u, e, t), do the following. Compute (K, κ) ← h(uα ). dec(K; e). Kurosawa-Desmedt Hybrid Cryptosystem from [KD04]. We give a description due to [GS04] that differs from the original description from [KD04] in two aspects. ver). It also allows to use a computationally secure KDF. 30 Y. Desmedt, H. H. Phan Setup: On input the security parameter λ, return a λ-bit prime q, a group G of order q, and its two randomly chosen different generators g1 , g2 ∈ G. ver), a KDF kdf from G to the set of keys of (sym, mac), and a target-collision-resistant function family T CR : G2 → ZZ q .

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.

Hence the correctness of K holds as well as DPP07. Relationship Between DPP07 and Scheme1. We describe the differences of algorithms between DPP07 and Scheme1. Setup: In Scheme1 the algorithm generates a dummy key dk0 = (u0 , A0 , B0 = H0 ) and publishes it, while in DPP07 does not. Due to the dummy key, an arbitrary entity can compute a session key K efficiently without n elements Vi (i = 1, . . , n) in the encryption key. However, publishing dk0 enables any entity to decrypt an arbitrary header even if she/he does not have a decryption key.

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