By Maciej Grześkowiak (auth.), Kanta Matsuura, Eiichiro Fujisaki (eds.)
This e-book constitutes the refereed lawsuits 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 rigorously reviewed and chosen from ninety four submissions. The papers are equipped in topical sections on cryptography, signature and signcryption, software program safety, privateness safeguard and contents security, authentication and entry keep watch over, in addition to implementation.
Read Online or Download Advances in Information and Computer Security: Third International Workshop on Security, IWSEC 2008, Kagawa, Japan, November 25-27, 2008. Proceedings PDF
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Extra resources for Advances in Information and Computer Security: Third International Workshop on Security, IWSEC 2008, Kagawa, Japan, November 25-27, 2008. Proceedings
The reduction attacks in the cases of SFLASH ,  and HFE  were proposed. This process is used for the attack by using a diﬀerential against the Minus method. Moreover, this reduction is also useful for our attack against IC schemes. We will see in the next section. As is well known, a polynomial is called a quadratic form or a homogeneous polynomial if all terms of it have degree 2. As for IC, each coordinate of F is a quadratic form. We will see how to use this property. The aim of this attack is to ﬁnd v = (v1 , .
2 has the advantage that we can save computational space. 4 Attack against IC- We will describe an attack against IC-, which is a Minus variation of IC. 1 Summary of Attack Against IC- In this section, we will show a brief sketch of our attack against IC- schemes. The Table 2 shows an algorithm of breaking signature schemes based on oddIC− scheme. Remember that IC- scheme is used for a signature scheme only (not an encryption one). The attack against IC- consists of 3 steps below. – Reduction to linear transformation – Recovering the deleted part by using a diﬀerential – Forging a signature This attack is summarized as follows.
Then, we obtain the simple relation below. BSNξ (a, b) = Π(Nξ (DP (a, b))) (18) We will see how to compute Nξ by using this relation in the next subsubsection. If once we ﬁnd Nξ , we can recover the projected part. By the deﬁnition of Nξ , we can arrive at the useful property as the following. (Π ◦ P )(Nξ (x)) = Π(T (F (Mξ ◦ S)(x))) = Π((T ◦ MF (ξ) )(F ◦ S)(x)) (19) Then recovering the deleted part by the projection Π is done as stated below. Pf := (P (1) , . . , P (n−r) , P (1) ◦ Nξ , . . , P (r) ◦ Nξ ) (20) Note that Pf does not have to correspond with original P because a veriﬁer checks Π(Pf ) only.