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An Efficient Dynamic Network Security Method based on Symmetric Block Cipher Algorithms

  • Journal of The Korea Society of Computer and Information
  • Abbr : JKSCI
  • 2008, 13(4), pp.169-176
  • Publisher : The Korean Society Of Computer And Information
  • Research Area : Engineering > Computer Science

송병호 1 Sung-Ki Yang 2 배상현 2

1목포대학교
2조선대학교

Accredited

ABSTRACT

The existing block encryption algorithms have been designed for the encryption key value to be unchanged and applied to the round functions of each block, and enciphered. Therefore, it has such a weak point that the plaintext or encryption key could be easily exposed by differential cryptanalysis or linear cryptanalysis, both are the most powerful methods for decoding block encryption of a round repeating structure. Dynamic cipher has the property that the key-size, the number of round, and the plaintext-size are scalable simultaneously. Dynamic network is the unique network satisfying these characteristics among the networks for symmetric block ciphers. We analyze the strength of Dynamic network for meet-in-the-middle attack, linear cryptanalysis, and differential cryptanalysis. Also, In this paper we propose a new network called Dynamic network for symmetric block ciphers.

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