IC card, terminal device, and data communication method
US7357329B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 9, 2003 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Aug 15, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2143
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention avoids duplication and loss of digital contents by a transmitter/receiver and a malicious third party when the digital contents are transmitted on a communication platform where direct communication is performed between IC cards. A data communications method relating to the present invention includes the steps of executing a predetermined command when an IC card 1a receives a predetermined trigger signal; storing a state of the IC card 1a before transmission of first digital contents; performing an encryption process on the first digital contents based on key information associated with the first digital contents; deleting the first digital contents from a holder 18 of the IC card 1a when a commit instruction indicating completion of a reception process on the encrypted first digital contents is received from a destination device 1b: and performing a return process to the state of the IC card 1a when a transmission process on the first digital contents is interrupted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.