Abstract
In this paper, we introduce improved differential and linear attacks on the SMS4 block cipher which is used in the Chinese national standard WAPI (WLAN Authentication and Privacy Infrastructure, WLAN - Wireless Local Area Network): First, we introduce how to extend previously known differential attacks on SMS4 from 20 or 21 to 22 out of the full 32 rounds. Second, we improve a previously known linear attack on 22-round reduced SMS4 from 2119 known plaintexts, 2109 memory bytes, 2117encryptions to 2117 known plaintexts, 2109 memory bytes, 2112.24 encryptions, by using a new linear approximation.
| Translated title of the contribution | Improved Security Analysis of Reduced SMS4 Block Cipher |
|---|---|
| Original language | Korean |
| Pages (from-to) | 3-10 |
| Number of pages | 8 |
| Journal | 정보보호학회논문지 |
| Volume | 19 |
| Issue number | 3 |
| State | Published - 2009 |