Patent ID: 8738539
Filing Date: 2014-05-27
Classification: G06Q,H04L

Abstract:
1. A method for implementing a digital cash protocol for a user having two pairs of user keys, one pair linked to the real identity of the user including a master public key (mPKU) and a master secret key (mSKU), and a second pair linked to the pseudonym identity of the user including a pseudonym public key (pPKU) and a pseudonym secret key (pSKU), in a system including a certificate authority, a bank of the user, an issuer of digital cash virtual accounts, a shop and a bank of the shop, the method comprising: providing a processing device of a user, a processing device of a certificate authority, a processing device of a bank of the user, a processing device of an issuer of digital cash virtual accounts, a processing device of a shop and a communications link; using the processing device of a user and a communication link; registering a user with the certificate authority to store the pPKU in connection with a user id (UID) and the mPKU; using the processing device of the certificate authority and the communication link; and issuing a license for the pPKU in response to a request from the user for digital currency which is signed by the mPKU; using the processing device of an issuer of digital cash; opening an account by an issuer of digital cash virtual accounts to store the pPKU of a registered user; using the processing device of the issuer of digital cash; issuing digital cash in the account in response to a request from the user bank; storing information related to the issued digital cash in the account; using the processing device of the issuer of digital cash and a communications link; paying the digital cash to a shop for goods and services; and depositing the digital currency in the bank of the shop.