Title:
IC CARD AND ENCRYPTION PROCESSING SYSTEM
Document Type and Number:
Japanese Patent JP2004326335
Kind Code:
A
Abstract:
To provide an IC card having a system to prevent secret data stored in an IC card from being leaked to the outside.
The RAM 7 of an IC card 1 is provided with a plurality of areas, and a plaintext received from an IC reader/writer 2 and random number data generated by a random number generating module 5 are stored in the RAM 7 area at random. The plaintext and the random number data are encrypted by an encrypting module 4, and the encryption result is stored in the RAM 7 area. The RAM 7 area in which the plaintext is stored is set by one random number data. Only the encryption result of the plaintext is read from the RAM 7 area, and transmitted to the IC card reader/writer 2.
Inventors:
NAKANO HIROO
Application Number:
JP2003118634A
Publication Date:
November 18, 2004
Filing Date:
April 23, 2003
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G06F12/14; G06F21/60; G06F21/62; G06F21/75; G06F21/77; G06K19/073; G09C1/00; (IPC1-7): G06K19/073; G06F12/14; G09C1/00
Attorney, Agent or Firm:
Hideaki Togawa
Previous Patent: COMMUNICATION CARD SYSTEM, COMMUNICATION CARD AND HOST
Next Patent: EXTENSION DEVICE FOR PROCESS CONTROL COMPUTER
Next Patent: EXTENSION DEVICE FOR PROCESS CONTROL COMPUTER