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By David Pointcheval (auth.), Kwangjo Kim (eds.)
Annually backed by means of the Korea Institute of data protection and Crypt- ogy (KIISC), the fourth foreign convention on info safety and Cryptology (ICISC2001) was once held on the sixty three development in Seoul, Korea, Dec- ber 6–7, 2001. The sixty three development, together with 60 tales above the floor and three tales underground, stands hovering up into the sky at the island of Youido, the ny of Korea, and ranks by way of a ways the tallest of all structures within the state. this system committee acquired 102 submissions from 17 international locations and areas (Australia, Belgium, China, Denmark, France, Germany, India, Italy, Japan, Korea, The Netherlands, Spain, Taiwan, Thailand, Vietnam, united kingdom, and USA), of which 32 have been chosen for presentation in eight classes. All submissions have been anonymously reviewed by means of not less than three specialists within the proper components. there has been one invited speak via David Pointcheval (ENS, France) on “Practical protection in Public-Key Cryptography”. we're very thankful to the entire application committee contributors who dedicated a lot e?ort and invaluable time to analyzing and choosing the papers. those p- ceedingscontainthe?nalversionofeachpaperrevisedaftertheconference.Since the revised models weren't checked through this system committee carefully, the authors needs to endure complete accountability for the contents in their papers.
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Extra resources for Information Security and Cryptology — ICISC 2001: 4th International Conference Seoul, Korea, December 6–7,2001 Proceedings
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Matsumoto. Security of camellia against truncated differential cryptanalysis. In Fast Software Encryption - Eighth International Workshop, preproceedings FSE’2001. 4. L. R. Knudsen. Truncated and higher order differential. In B. Preneel, editor, Fast Software Encryption - Second International Workshop, volume 1008 of Lecture Notes in Computer Science, pages 196–211. Springer-Verlag, 1995. 5. L. R. Knudsen. Analysis of camellia. 2000. 6. L. R. Knudsen and T. A. Berson. Truncated differentials of SAFER.
2 Impossible Differential of Crypton We introduce a four round impossible differential of Crypton. Fig. 5 describes one pattern of impossible differentials. The impossible differentials comes from the following observation. 1. If an input pair has zero difference at a byte, then the output pair after σ, γ, σ −1 , or γ −1 also has zero difference at the byte. 2. If an input pair has zero difference at byte[i][j], then the output pair after τ or τ −1 has zero difference at byte[j][i]. 3. π, the word transformation has the branch number 4 as a map from 4byte input to 4-byte output.
We can compose the same encryption system by putting σK eq and σK eq between γ and π of their rounds. e. π −1 ◦ τ −1 (K) The procedure is as follow: 1. A structure is defined as a set of plaintexts which have certain fixed values in the column 1, 2, and 3. One structure consists of 232 plaintexts and proposes 232 × 232 × 12 = 263 pairs of plaintexts. 2. Take 259 structures (291 plaintexts, 2122 plaintext pairs). Choose plaintext pairs (P, P ∗ ) such that the pairs (C6 , C6∗ ) has zero difference at the row 0 and 1, where C6 = πe−1 ◦ τ −1 ◦ σnull ◦ τ −1 ◦ πe−1 ◦ τ −1 (C) and C is a ciphertext of P .