Offline Micropayments without Trusted Hardware

Blaze, Matt; Ioannidis, John; Keromytis, Angelos D.

We introduce a new micropayment scheme, suitable for certain kinds of transactions, that requires neither online transactions nor trusted hardware for either the payer or payee. Each payer is periodically issued certified credentials that encode the type of transactions and circumstances under which payment can be guaranteed. A risk management strategy, taking into account the payers’ history, and other factors, can be used to generate these credentials in a way that limits the aggregated risk of uncollectable or fraudulent transactions to an acceptable level. These credentials can also permit or restrict types of purchases. We show a practical architecture for such a system that uses a Trust Management System to encode the credentials and policies. We describe a prototype implementation of the system in which vending machine purchases are made using consumer PDAs.



Also Published In

Financial cryptography: 5th International Conference, FC 2001, Grand Cayman, British West Indies, February 19-22, 2001: proceedings

More About This Work

Academic Units
Computer Science
Lecture Notes in Computer Science, 2339
Published Here
July 12, 2012