Download Advances in Information and Computer Security: Third by Maciej Grześkowiak (auth.), Kanta Matsuura, Eiichiro PDF

By Maciej Grześkowiak (auth.), Kanta Matsuura, Eiichiro Fujisaki (eds.)

This publication constitutes the refereed complaints of the 3rd foreign Workshop on safeguard, IWSEC 2008, held in Kagawa, Japan, in November 2008.

The 18 revised complete papers provided including 1 invited speak have been conscientiously reviewed and chosen from ninety four submissions. The papers are equipped in topical sections on cryptography, signature and signcryption, software program safeguard, privateness security and contents security, authentication and entry keep an eye on, in addition to implementation.

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Extra info for Advances in Information and Computer Security: Third International Workshop on Security, IWSEC 2008, Kagawa, Japan, November 25-27, 2008. Proceedings

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Qel , B) end procedure Return prime qi and ai , bi : qi = F (ai , bi ) Return ri (mod qi ) Return ri (mod qi ) Use the Chinese Remainder Theorem Chosen Ciphertext Secure Public Key Encryption with a Simple Structure Goichiro Hanaoka1 , Hideki Imai1,2 , Kazuto Ogawa3, and Hajime Watanabe1 1 RCIS, AIST, Japan Chuo University, Japan Japan Broadcasting Corporation, Japan 2 3 Abstract. In this paper, we present a new public key encryption scheme with an easy-to-understand structure. More specifically, in the proposed scheme, for fixed group elements g1 , .

L , define Mξ : L → L (A1 , . . , A ) → (ξ1 A1 , . . , ξ A ) . (13) We can check F ◦ Mξ = MF (ξ) ◦ F . Here, remember that a differential DF (A, B) = F (A + B) − F (A) − F (B) + F (0). For A = (A1 , . . , A ) and B = (B1 , . . , B ), we have the specific form of DF below. λ1 λ1 DF (A, B) = (A1 q B2 + B1 q A2 , . . ,ξ qλ +ξ1 ) . (15) 42 N. Ogura and S. Uchiyama A differential has various properties. If S is linear, the relation between DF and DP is easily shown as follows. DP (a, b) = (T ◦ DF )(S(a), S(b)) (16) Thus, DP , which is generated by a public-key P , takes over properties of DF .

1 Reduction to linear transformation 2 Recovering the deleted part by using a differential 2–1 Finding linear equations using a differential 2–2 Solving the equations and recovering the part deleted by a projection 3 Forging a signature 3–1 Finding forging equations (9), (11) 3–2 Forging a signature by using the forging equations This method does not ensure whether we obtain non-trivial Nξ = S −1 ◦ Mξ ◦ S in step 2–2. So our algorithm checks whether we can find non-trivial forging equations (9) in step 3–1.

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