Related-key attacks on DDP based ciphers: CIKS-128 and CIKS-128H

Youngdai Ko; Changhoon Lee; Seokhie Hong; Jaechul Sung; Sangjin Lee

doi:10.1007/978-3-540-30556-9_16

Related-key attacks on DDP based ciphers: CIKS-128 and CIKS-128H

Youngdai Ko, Changhoon Lee, Seokhie Hong, Jaechul Sung, Sangjin Lee

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

CIKS-128 and CIKS-128H are 128-bit block ciphers with a 256-bit key sizes based on data-dependent operations, respectively. They are also fast hardware-oriented ciphers and improvements of block cipher CIKS-1 introduced in [14]. This paper presents related-key differential attacks on full-round CIKS-128 and CIKS-128H. In result, using full-round related-key differential characteristics with probability 2^-36 and 2^-35.4, these attacks can recover the partial subkey bits for CIKS-128 and CIKS-128H with about 2⁴⁰ plaintexts, respectively. These works suggests that the greatest possible care has to be taken when proposing improvements of the existing block ciphers.

Original language	English
Pages (from-to)	191-205
Number of pages	15
Journal	Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume	3348
DOIs	https://doi.org/10.1007/978-3-540-30556-9_16
Publication status	Published - 2004

Keywords

Block Cipher
CIKS-128
CIKS-128H
Data-Dependent Operation
Related-Key Differential Attack

ASJC Scopus subject areas

Theoretical Computer Science
Computer Science(all)

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Related-key attacks on DDP based ciphers : CIKS-128 and CIKS-128H. / Ko, Youngdai; Lee, Changhoon; Hong, Seokhie; Sung, Jaechul; Lee, Sangjin.

In: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Vol. 3348, 2004, p. 191-205.

Research output: Contribution to journal › Article › peer-review

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AU - Hong, Seokhie

AU - Sung, Jaechul

AU - Lee, Sangjin

PY - 2004

Y1 - 2004

N2 - CIKS-128 and CIKS-128H are 128-bit block ciphers with a 256-bit key sizes based on data-dependent operations, respectively. They are also fast hardware-oriented ciphers and improvements of block cipher CIKS-1 introduced in [14]. This paper presents related-key differential attacks on full-round CIKS-128 and CIKS-128H. In result, using full-round related-key differential characteristics with probability 2-36 and 2-35.4, these attacks can recover the partial subkey bits for CIKS-128 and CIKS-128H with about 240 plaintexts, respectively. These works suggests that the greatest possible care has to be taken when proposing improvements of the existing block ciphers.

AB - CIKS-128 and CIKS-128H are 128-bit block ciphers with a 256-bit key sizes based on data-dependent operations, respectively. They are also fast hardware-oriented ciphers and improvements of block cipher CIKS-1 introduced in [14]. This paper presents related-key differential attacks on full-round CIKS-128 and CIKS-128H. In result, using full-round related-key differential characteristics with probability 2-36 and 2-35.4, these attacks can recover the partial subkey bits for CIKS-128 and CIKS-128H with about 240 plaintexts, respectively. These works suggests that the greatest possible care has to be taken when proposing improvements of the existing block ciphers.

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KW - Data-Dependent Operation

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Related-key attacks on DDP based ciphers: CIKS-128 and CIKS-128H

Abstract

Keywords

ASJC Scopus subject areas

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