Abstract
Recently, several DDP, DDO and COS-based block ciphers have been proposed for hardware implementations with low cost. However, most of them are vulnerable to related-keyt attacks. A 12-round block cipher SCOS-3 is desinged to eliminate the weakness of DDP, DDO and COS-based block ciphers. In this paper, we propose a related-key differential attack on an 11-round reduced SCOS-3. The attack on an 11-round reduced SCOS-3 requires related-key chosen plaintexts and 11-round reduced SCOS-3 encryptions. This work is the first known attack on SCOS-3. Therefore, SCOS-3 is still vulnerable to related-key attacks.
| Translated title of the contribution | Security Analysis of SCOS-3 Block Cipheragainst a Related-Key Attack |
|---|---|
| Original language | Korean |
| Pages (from-to) | 977-983 |
| Number of pages | 7 |
| Journal | 한국항행학회논문지 |
| Volume | 13 |
| Issue number | 6 |
| State | Published - 2009 |