Keisuke Tanaka, Yuji Suga's Advances in Information and Computer Security: 10th PDF

By Keisuke Tanaka, Yuji Suga

ISBN-10: 3319224247

ISBN-13: 9783319224244

ISBN-10: 3319224255

ISBN-13: 9783319224251

This publication constitutes the complaints of the tenth overseas Workshop on safety, IWSEC 2015, held in Nara, Japan, in August 2015. The 18 complete papers and three brief papers provided during this quantity have been conscientiously reviewed and chosen from fifty eight submissions. They have been equipped in topical sections named: identity-based encryption; elliptic curve cryptography; factoring; symmetric cryptanalysis; provable protection; LWE-based encryption; privacy-preserving and anonymity; safe protocol; platforms safeguard; and safety in hardware.

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Extra info for Advances in Information and Computer Security: 10th International Workshop on Security, IWSEC 2015, Nara, Japan, August 26-28, 2015, Proceedings

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Ur R ). Since ui ’s, h, g, u , h and X3 are publicly available, anyone can re-randomize dkID|k ,T := (a0 , a1 , a2 , bk+1 , . . , b ) by computing a0 (uI00 · · · uIkk h)r (u T h )t X3s0 , a1 g r X3s1 , a2 g t X3s2 , s s bk+1 urk+1 X3 k+1 , . . , b ur X3 $ with randomly chosen r , t , s0 , s1 , s2 , sk+1 , . . , s ← Zn . Theorem 1. The proposed RHIBE scheme is IND-RID-CPA secure under Assumptions 1, 2, and 3. Adaptive-ID Secure Revocable Hierarchical Identity-Based Encryption 29 Before giving the proof, we explain our strategy.

Since there are many routes for generating decryption keys in the RHIBE context, in the security proof we need to guarantee not only a decryption key is nominally semi-functional but also a decryption key generated by key update information and a secret key is nominally semi-functional. 2 Preliminaries In this section, we give the definitions of complexity assumptions. Let G be a group generator which takes as input the security parameter λ, and outputs (n = p1 p2 p3 , G, GT , e), where G and GT be cyclic groups with order n, p1 , p2 , and p3 are distinct prime numbers, and e : G × G → GT is an efficient, nondegenerate bilinear map.

Semi-functional Ciphertext: Let g2 be a generator of Gp2 , and let (C , C0 , C1 , C2 ) be a ciphertext generated by the encryption algorithm. Choose x, zc ← Zn , and set (C , C0 , C1 , C2 ) = (C , C0 g2x , C1 g2xzc , C2 ). $ Semi-functional Secret Key: Let {(a0,θ , a1,θ , bi+1,θ , . . , b ,θ )}θ be a secret $ key skID|i−1 by the SKGen algorithm. Choose zk ← Zn and for each θ $ choose γθ , zi+1,θ , . . , z ,θ ← Zn , and set {(a0,θ , a1,θ , ki+1,θ , . . , k γ z γ z {(a0,θ g2γθ zk , a1,θ g2γθ , ki+1,θ g2 θ i+1,θ , .

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Advances in Information and Computer Security: 10th International Workshop on Security, IWSEC 2015, Nara, Japan, August 26-28, 2015, Proceedings by Keisuke Tanaka, Yuji Suga


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