Efficient masked implementation for SEED based on combined masking

Hee Seok Kim, Young In Cho, Dooho Choi, Dong Guk Han, Seokhie Hong

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This paper proposes an efficient masking method for the block cipher SEED that is standardized in Korea. The nonlinear parts of SEED consist of two S-boxes and modular additions. However, the masked version of these nonlinear parts requires excessive RAM usage and a large number of operations. Protecting SEED by the general masking method requires 512 bytes of RAM corresponding to masked S-boxes and a large number of operations corresponding to the masked addition. This paper proposes a new-style masked S-box which can reduce the amount of operations of the masking addition process as well as the RAM usage. The proposed masked SEED, equipped with the new-style masked S-box, reduces the RAM requirements to 288 bytes, and it also reduces the processing time by 38% compared with the masked SEED using the general masked S-box. The proposed method also applies to other block ciphers with the same nonlinear operations.

Original languageEnglish
Pages (from-to)267-274
Number of pages8
JournalETRI Journal
Issue number2
Publication statusPublished - 2011 Apr


  • Countermeasure
  • Masking method
  • SEED
  • Side channel attacks

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Electrical and Electronic Engineering


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