公开(公告)号：JP2000138668A

公开(公告)日：2000-05-16

申请号：JP28864699

申请日：1999-10-08

Applicant: ST MICROELECTRONICS SRL

Inventor： ITALIA FRANSCECO ,  FORTUNA LUIGI ,  BERITELLI FRANCESCO ,  DI COLA EUSEBIO

IPC: H04L9/26 ,  H04L9/00 ,  H04L12/22 ,  H04L12/56

Abstract: PROBLEM TO BE SOLVED: To enhance a security level in an encipherment system based on a digital chaos model. SOLUTION: The processing is started from a couple of password codes or user keys, a discrete chaos model or map having a couple of the password codes or user keys is generated, a couple of the updated password codes or keys are dynamically generated for each processing step of a certain number in the chaos map, data to be transmitted in a transmission station are masked through logical combination with the dynamically updated keys at present, and a reception station eliminates the mask from the data by separating logically the digital data from the dynamically updated keys at present to restore the digital data in a clear state.