Information Security and Privacy: 19th Australasian by Willy Susilo, Yi Mu

By Willy Susilo, Yi Mu

This e-book constitutes the refereed convention lawsuits of the nineteenth Australasian convention on info safeguard and privateness, ACISP 2014, held in Wollongong, NSW, Australia, in July 2014. The 26 revised complete papers and six brief papers awarded during this quantity have been conscientiously chosen from ninety one submissions. The papers are equipped in topical sections on cryptanalysis; cryptographic protocols; fine-grain cryptographic protocols; key trade, basics, lattices and homomorphic encryption, and applications.

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Additional resources for Information Security and Privacy: 19th Australasian Conference, ACISP 2014, Wollongong, NSW, Australia, July 7-9, 2014. Proceedings

Example text

Taga, S. Moriai, and K. Aoki plaintext : P(64) K(1)(128) ȡ X(1)(64) K(2)(128) ȡ X(2)(64) K(3)(128) ȡ X(3)(64) K(4)(128) ȡ X(4)(64) K(5)(128) ȡ X(5)(64) (6) XS K (128) X(6)(64) K(7)1(64) ciphertext : C(64) P(64) K(1)1(64) c4 65 c8 8b I(1)K1(64) I(1)s1(64) s s s s s s s s mdsL I(1)mL(64) mdsL S-function MDS L-function K(1)2(64) I(1)K2(64) I(1)s2(64) c8 8b c4 65 65 c8 8b c4 Each element is an element of GF(28). The primitive polynomial is p(z) = z8 + z6 + z5 + z + 1. s s s s s s s s MDSH X(1) (64) X(5)(64) K(6)1(64) I(6)K1(64) I(6)s1(64) mdsL = 8b c4 65 c8 s s s s s s s s mdsL I(6)mL(64) MDS H-function 10101110 11011111 11100111 MDSH = 0 1 0 1 1 1 0 1 11010101 11101010 11111101 10101011 Each element is multiplied by 8-bit data.

6 Conclusion We found particular differential characteristics in key scheduling of HierocryptL1. They have no active S-boxes, that is, their probability is 1. Such characteristics do not exist in many block ciphers [14,1,22,18,10,12], except the trivial example like DES [20] with no S-boxes in its key scheduling part. Using these characteristics, we present two related-key attacks on the middle 8 S-function layers of Hierocrypt-L1. One is an ordinary differential attack, for which the data/memory/time complexities are 261 chosen plaintexts with two related keys/2117 /2120 .

Now observe the equation defining πt . Note that Φt consists of tap locations that add linearly to the output function and πt consists of the locations that feed the non-linear h function in the original generalized Grain cipher. Thus the lin() of lin(Φt ) and 2 · OR(πt ) will effectively capture the difference between actual tth round keystream bits zt and ztβ in the two initializations of the generalized cipher. 2. Update rule of βL: In the original cipher, the update to the LFSR is the GF(2) sum of 2 parts: the keystream bit zt and the linear update function f over the LFSR bits yt , yt+f1 , yt+f2 , .

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