A New Crossing Structure Based DB-DES Algorithmfor Enhancing Encryption Security

Junyong Lee; 김대영

Journal of The Korea Society of Computer and Information

Abbr : JKSCI
2007, 12(2), pp.63-70
Publisher : The Korean Society Of Computer And Information
Research Area : Computer Science

Junyong Lee ¹, 김대영 ²

¹홍익대학교
²홍익대학교

ABSTRACT

The Data Encryption Standard (DES) is a block cipher that encrypts a 64 bit block of plaintext into a 64 bit block of ciphertext. The DES has been a worldwide standard for 20 years since it was adopted in 1976. strong. But, due to the rapid development of hardware techniques and cryptanalysis, the DES with 64-bit key is considered to be not secure at the present time. Therefore it became necessary to increase the security of DES. The NG-DES(New Generation DES)[1] is an encryption system which upgrades the encryption security of DES by the key extension and the usage of non-linear f function. It extends not only the size of plaintext and ciphertext to 128 bit but also the Fiestel structure used in each round. This structure has a weak point that the change of each bit of plaintext does not affect all bits of ciphertext simultaneously. In this paper, we propose a modified Fiestel structure of DES and thus increased confusion and diffusion by effectively cross-connecting between outputs in a round and inputs in next round.
KEYWORDS

하드웨어 설계(Hardware design), 컴퓨터 구조(Computer Architecture), 암호화 알고리즘(Encryption Algorithm), DES(Data Encryption Standard), 암호화 프로세서(Encryption processor)
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