Transaction signature for offline payment processing system
First Claim
1. A computer-implemented method for processing a withdrawals of funds during offline payment processing of purchases, comprising:
- starting a payment session by a mobile communication device;
establishing, by the mobile communication device, a network connection with a computer managing smart card device accounts;
receiving, by the mobile communication device, a session access key from, the computer managing the smart card device accounts;
establishing, by the mobile communication device, a communication channel with a smart card device while the mobile communication device is without a network connection to the computer managing the smart card device accounts;
receiving, by the mobile communication device and from the smart card device, a smart card device transaction history comprising a listing of previous deposit transactions and a listing of previous withdrawal transactions;
calculating, by the mobile communication device, an amount of previous withdrawals using the listing of previous withdrawal transactions and an amount of previous deposits using the listing of previous deposit transactions;
authorizing, by the mobile communication device and without a network connection to the computer managing the smart card device accounts, an offline debit transaction by determining that a current transaction amount is less than or equal to a difference between the amount of previous deposits and the amount of the previous withdrawals;
creating, by the mobile communication device, an offline withdrawal transaction record subtracting the current transaction amount from a smart card device account balance;
signing, by the mobile communication device, the withdrawal transaction record using the session access key; and
writing, by the mobile communication device, the signed withdrawal transaction record to the smart card device transaction history, the signed withdrawal transaction record indicating the current transaction amount debited from the smart card device account balance and the session access key signature.
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Accused Products
Abstract
Preventing fraud during an offline transaction by encoding a randomly-generated card verification code onto a smart card. The verification code is transmitted to a contactless device during each transaction, wherein it is cross-referenced with the account number to ensure presence of the card. Also, every transaction record is signed by an access key resident on the contactless device and certified by a signing key resident on a remote system. Funds may be deposited onto the card when the contactless device creates a deposit request, signs the request using an access key and transmits it to the remote system, which in turn processes the request and certifies it with a signing key. Funds may be withdrawn when the contactless device creates a withdrawal record and signs it using an access key. The remote system verifies the signatures and certifies the records using a signing key when the records are later transmitted.
35 Citations
20 Claims
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1. A computer-implemented method for processing a withdrawals of funds during offline payment processing of purchases, comprising:
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starting a payment session by a mobile communication device; establishing, by the mobile communication device, a network connection with a computer managing smart card device accounts; receiving, by the mobile communication device, a session access key from, the computer managing the smart card device accounts; establishing, by the mobile communication device, a communication channel with a smart card device while the mobile communication device is without a network connection to the computer managing the smart card device accounts; receiving, by the mobile communication device and from the smart card device, a smart card device transaction history comprising a listing of previous deposit transactions and a listing of previous withdrawal transactions; calculating, by the mobile communication device, an amount of previous withdrawals using the listing of previous withdrawal transactions and an amount of previous deposits using the listing of previous deposit transactions; authorizing, by the mobile communication device and without a network connection to the computer managing the smart card device accounts, an offline debit transaction by determining that a current transaction amount is less than or equal to a difference between the amount of previous deposits and the amount of the previous withdrawals; creating, by the mobile communication device, an offline withdrawal transaction record subtracting the current transaction amount from a smart card device account balance; signing, by the mobile communication device, the withdrawal transaction record using the session access key; and writing, by the mobile communication device, the signed withdrawal transaction record to the smart card device transaction history, the signed withdrawal transaction record indicating the current transaction amount debited from the smart card device account balance and the session access key signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A mobile communication device comprising:
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a non-transitory computer-readable medium having computer-readable program instructions embodied therein that when executed by a computer cause the computer to perform the steps of; receiving a session access key via a network connection from a computer managing smart card device accounts; establishing, by a mobile communication device, a communication channel with a smart card device while the mobile communication device is without a network connection to the computer managing the smart card device accounts; receiving, from the smart card device, a smart card device transaction history comprising a listing of previous deposit transactions and a listing of previous withdrawal transactions; calculating an amount of previous withdrawals using the listing of previous withdrawal transactions and an amount of previous deposits using the listing of previous deposit transactions; authorizing, without a network connection to the computer managing the smart card device accounts, an offline debit transaction by determining that a current transaction amount is less than or equal to a smart card device account balance calculated using an amount of previous deposit transactions and an amount of the previous withdrawal transactions received in the transaction history; creating an offline withdrawal transaction record subtracting the current transaction amount from a smart card device account balance; signing the withdrawal transaction record using the session access key; and writing the signed withdrawal transaction record to the smart card device transaction history, the signed withdrawal transaction record indicating the current transaction amount debited from the smart card device account balance and the session access key signature. - View Dependent Claims (13, 14, 15, 16, 18, 19, 20)
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17. A system for processing withdrawals of funds during offline payment processing of purchases, comprising:
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a mobile communication device processor; and a storage device comprising hardware storing executable instructions that when executed by the processor cause the processor to execute the steps of; establishing, by a mobile communication device, a communication channel with a smart card device while a mobile communication device is without a network connection to a computer managing smart card device accounts; receiving, from the smart card device, a smart card device transaction history comprising a listing of previous deposit transactions and a listing of previous withdrawal transactions; calculating an amount of previous withdrawals using the listing of previous withdrawal transactions and an amount of previous deposits using the listing of previous deposit transactions; authorizing, without a network connection to the computer managing the smart card device accounts, an offline debit transaction by determining that a current transaction amount is less than or equal to a smart card device account balance calculated using an amount of previous deposit transactions and an amount of the previous withdrawal transactions received in the transaction history; creating an offline withdrawal transaction record subtracting the current transaction amount from a smart card device account balance; signing the withdrawal transaction record using a session access key; and
writing the signed withdrawal transaction record to the smart card device transaction history, the signed withdrawal transaction record indicating the current transaction amount debited from the smart card device account balance and the session access key signature.
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Specification