公开(公告)号：JPH07297819A

公开(公告)日：1995-11-10

申请号：JP7300594

申请日：1994-04-12

Applicant: TANDEM COMPUTERS INC

Inventor： MAATEIN EMU ATARA ,  DABURIYUU DEERU HOPUKINZU

IPC: G09C1/00 ,  H04L9/06 ,  H04L9/10 ,  H04L9/14 ,  H04L9/32

Abstract: PURPOSE: To improve reliability in a message from node to node by using one session key for encrypting a personal identification number(PIN) together with a message authentication code(MAC), random number, message and continuous numbers. CONSTITUTION: When a user inputs his own PIN 37 at a starting node 31, the PIN is transformed into a block, together with additional data bits and the PIN of reference bit length is formed. Furthermore, transaction data or a message 41 is linked with continuous numbers 43. These linked message and continuous numbers are encrypted by an ordinary DES module 45 by the PIN and one field 53 in these data is operated as a MAC. The field 53 of selected MAC is encrypted by an ordinary encryption module 55 together with the random number, while using a session key K1 as an encryption key 50. Moreover, a PIN 39 is encrypted by a DES encryption module 60, while using the session key K1 as the encryption key 50.