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

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

This e-book constitutes the refereed court cases of the 3rd overseas Workshop on protection, IWSEC 2008, held in Kagawa, Japan, in November 2008.

The 18 revised complete papers awarded including 1 invited speak have been conscientiously reviewed and chosen from ninety four submissions. The papers are prepared in topical sections on cryptography, signature and signcryption, software program protection, privateness safeguard and contents safety, authentication and entry keep watch over, in addition to implementation.

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0, . . , n/ − 1} . Then, the central map of IC scheme is λ1 F : L → L ; (A1 , . . , A ) → (A1 q A2 , . . , A qλ A1 ) . e. K = F2 ), are required for bijectivity of the central map. Then, for A = (A1 , . . , A ), the explicit central map of these schemes is given as follows. F (A) = (A1 A2 , A2 A3 , . . , A A1 ) (q : a power of two) for (q = 2) for (A21 A2 , A2 A3 , . . , A A1 ) : odd : even (3) We call these scheme odd-IC scheme and even-IC scheme, respectively. 3 IC- In [4], some schemes with modifiers were also proposed due to enforcing an IC scheme.

Ogura and S. Uchiyama Table 3. 1 Table 4. 3 Table 5. 6 Table 6. 2 IC- Case We will explain about our attack experiments against IC- schemes. In this section, we classify our algorithm into 5 steps below. 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.

However, this scheme is not very easy-to-understand any more, and furthermore, is still less efficient than [25] in all practical aspects. 4 For -bit security, length of outputs for both TCR and h are determined as -bit long. Chosen Ciphertext Secure Public Key Encryption with a Simple Structure 6 29 Random Oracle Model vs. Standard Model Here, we give a brief comparison of our proposed scheme with ECIES by focusing on their methods for simulating decryption oracles (under the GDH assumption). This comparison would clarify an essential difference between the random oracle model and the standard model.

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