System and method for communication between smart cards

US8397058B1 · kind B1 · utility

Assignee

• Mondex International Limited · GB

Inventors

• Kazuo J. Ezawa · Clinton, US
• Dave Roberts · Saratoga, US
• Michael S. Foster · Federal Way, US
• John T. Kelly · Saratoga, US

Key dates

• Filing date: Jul 28, 2000
• Grant date: Mar 12, 2013
• Expiry date: Nov 7, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G07F7/082
• WIPO field: IT methods for management
• WIPO sector: Electrical engineering

Abstract

A method and system which provides communication between a first portable device and a second portable device. The first portable device stores a first sequence number and a first key, and the second portable device stores a second sequence number and a second key. Verification is performed using the first and second keys. The first sequence number is compared to the second sequence number. If the second sequence number is newer than the first sequence number, the first sequence number is set to have a value of the second sequence number if the verification succeeds. If the first sequence number is newer than the second sequence number, the second sequence number is set to have a value of the first sequence number if verification succeeds.