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By Keisuke Tanaka, Yuji Suga

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

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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 g . B sends public parameters mpkmLW = sets u = g c and h = u α {n, g, h, u0 , . . , u , e(g, g) , u , h , X3 } to A. For a decryption key query (ID|j , T ) where ID|j = (I0 , . . , Ij ), B computes a semi-functional decryption key dkID|j ,T as follows.

I∗k∗ ) to B. B chooses b ← {0, 1}, and computes C = Mb · T¯, C0 = ∗ ∗ (g s Y2 )a0 I0 +···+ak∗ Ik∗ +b , C1 = g s Y2 , and C2 = (g s Y2 )d . If T¯ = e(g, g)αs , then C = Mb e(g, g)αs . Therefore, this is a semi-functional ciphertext of Mb . If T¯ is a random element of GT , then this is a semi-functional ciphertext of a random message. So, B uses the output of A for breaking Assumption 3. 5 Conclusion In this paper, we propose the first adaptive-ID secure and scalable RHIBE scheme. Moreover, our construction has the advantages of the Seo-Emura RHIBE scheme [13]; that is, it has the history-free update, security against insiders, short ciphertexts, and decryption key exposure resistance.

U , e(g, g) , u , h , X3 } to A. mpk For a secret key query ID|j = (I0 , . . , Ij ), B generates a semi-functional secret key as follows. B chooses cθ , rθ , tθ , wθ , zθ , zj+1,θ , . . , z for each θ, and computes skID|j as ,θ , wj+1,θ , . . , w ,θ $ ← Zn (Pθ Z2cθ (uI00 · · · ujj h)rθ X3wθ , g rθ Z2zθ X3tθ , I z w z θ urj+1 Z2 j+1,θ X3 j+1,θ , . . , urθ Z2 ,θ w X3 ,θ ) θ . For a key update information query (ID|j , T ) where ID|j = (I0 , . . , Ij ), B generates semi-functional key update information as follows.

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