Download Advances in Information and Computer Security: 10th by Keisuke Tanaka, Yuji Suga PDF

By Keisuke Tanaka, Yuji Suga

This publication constitutes the complaints of the tenth overseas Workshop on protection, IWSEC 2015, held in Nara, Japan, in August 2015. The 18 complete papers and three brief papers offered 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 safety; LWE-based encryption; privacy-preserving and anonymity; safe protocol; structures safeguard; and safeguard in hardware.

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Additional 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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9(7), 1193–1205 (2014) 13. : Revocable hierarchical identity-based encryption: historyfree update, security against insiders, and short ciphertexts. In: Nyberg, K. ) CT-RSA 2015. LNCS, vol. 9048, pp. 106–123. Springer, Heidelberg (2015) 14. : RHIBE: constructing revocable hierarchical ID-based encryption from HIBE. Informatica Lith. Acad. Sci. 25(2), 299–326 (2014) 15. : Dual system encryption: realizing fully secure IBE and HIBE under simple assumptions. In: Halevi, S. ) CRYPTO 2009. LNCS, vol.

Suppose there exists an adversary A such that Gameku k−1 AdvA − ku Gamek AdvA = Then, we can build an algorithm B with advantage in breaking Assumption 2. $ Proof. First, B is given (g, X1 X2 , X3 , Y2 Y3 , T¯). B chooses α, a0 , . . , a , b ← Zn and sets g = g, ui = g ai (i ∈ [0, ]), and h = g b . Moreover, B $ guesses T ∗ (with success probability at least 1/|T |), chooses c, d ← Zn , and −T ∗ d sets u = g c and h = u g . B sends public parameters mpkmLW = α {n, g, h, u0 , . . , u , e(g, g) , u , h , X3 } to A.

Their key observation was that, on an elliptic curve in Weierstrass form, at least one of the curve parameters does not intervene in the expression of the addition and doubling formulas; more precisely, in commonly used coordinate systems, the addition and doubling formulas on: E : y 2 = x3 + ax + b do not involve the parameter b at all. As a result, if one perturbs the computation of a scalar multiplication kP by modifying the coordinates of P into those of a different point P not on the curve E, the computation carried out by the device is still an elliptic curve scalar multiplication k P , but on a different curve: E : y 2 = x3 + ax + ˜b where ˜b = yP2 − x3P − axP .

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