Design and evaluation of a block encryption algorithm using dynamic-key mechanism

Authors:
Chang-Doo Lee;Bong-Jun Choi;Kyoo-Seok Park
Affiliations:
Department of Computer Engineering, Kyungnam University, 449 Wolyoung dong, Masan, South Korea;Department of Computer Engineering, Kyungnam University, 449 Wolyoung dong, Masan, South Korea;Department of Computer Engineering, Kyungnam University, 449 Wolyoung dong, Masan, South Korea
Venue:
Future Generation Computer Systems - Special issue: Modeling and simulation in supercomputing and telecommunications
Year:
2004

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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 plain text 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. In order to cope with this weak point, an encryption algorithm using a more efficient key should be designed.In this paper, a block encryption algorithm which is designed for each encryption key value to be applied to each round block with a different value is proposed. This algorithm needs a short processing time in encryption and decryption, has a high intensity, can apply to electronic commerce and various applications of data protection.