Patent · US Expired

Protection system for intelligent cards

US4453074A · kind A · utility

426Cited by
1References
19Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 19, 1981
Grant dateJun 5, 1984
Priority date—
Expiry dateOct 19, 2001

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04L2463/102
  • WIPO fieldIT methods for management
  • WIPO sectorElectrical engineering

Abstract

There is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption is derived by an initialization terminal which uses the private key associated with the public key of a public-key cryptosystem key pair. Each transaction terminal with which a card is used decrypts the stored code in accordance with the public key. A transaction is effected only if the stored code decrypts into the user password which is inputted on a keyboard and the common reference text.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.