×

Efficient electronic money

  • US 5,511,121 A
  • Filed: 09/08/1994
  • Issued: 04/23/1996
  • Est. Priority Date: 02/23/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for performing an electronic cash transaction comprising the step oftransmitting via a communications link from a first electronic coin processing unit to a second electronic coin processing unit an electronic coin comprising a linkage of a public key of a party and a random element, said linkage being signed using a secret operation of a public key cryptographic system, wherein said public key has the form


  • space="preserve" listing-type="equation">P.sub.i =α

    .sup.Si mod p
where Pi is a public El Gamal Key of a party i, Si is a secret El Gamal Key of the party i which includes an identity Ii of the party i, and p and α

are publicly known numbers, andwherein said random element has the form u.tbd.α

r mod p, where r is a random number chosen by the party i.

View all claims
  • 10 Assignments
Timeline View
Assignment View
    ×
    ×