Three-Subset Meet-in-the-Middle Attack on Reduced XTEA

  • Yu Sasaki
  • Lei Wang
  • Yasuhide Sakai
  • Kazuo Sakiyama
  • Kazuo Ohta
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7374)

Abstract

This paper presents an improved single-key attack on a block-cipher XTEA by using the three-subset meet-in-the-middle (MitM) attack. Firstly, a technique on a generic block-cipher is discussed. It points out that the previous work applying the splice-and-cut technique to the three-subset MitM attack contains incomplete arguments, and thus it requires a very large data complexity, which is close to the code book. This paper gives a corrected procedure to keep the data complexity small. Secondly, the three-subset MitM attack is applied for reduced-round XTEA, which is a 64-bit block-cipher with 64-round Feistel network and a 128-bit key. 25 rounds are attacked with 9 known plaintexts and 2120.40 XTEA computations, while the previous best single-key attack only reaches 23 rounds. In the chosen-plaintext model, the attack is extended to 28 rounds with 237 chosen-plaintexts and 2120.38 computations.

Keywords

XTEA 3-subset meet-in-the-middle splice-and-cut multi-pair match 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Yu Sasaki
    • 1
  • Lei Wang
    • 2
  • Yasuhide Sakai
    • 2
  • Kazuo Sakiyama
    • 2
  • Kazuo Ohta
    • 2
  1. 1.NTT Secure Platform LaboratoriesNTT CorporationMusashino-shiJapan
  2. 2.The University of Electro-CommunicationsChoufu-shiJapan

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