Authors:
Andreas Schaad
1
;
Tobias Reski
1
and
Oliver Winzenried
2
Affiliations:
1
Faculty of Media, University of Applied Sciences Offenburg, Badstraße 24, 77652 Offenburg and Germany
;
2
Wibu-Systems AG, Rueppurer Strasse 52, 76137 Karlsruhe and Germany
Keyword(s):
Software Protection, Blockchain, Hyperledger.
Related
Ontology
Subjects/Areas/Topics:
Access Control
;
Applied Cryptography
;
Cryptographic Techniques and Key Management
;
Data Engineering
;
Data Integrity
;
Databases and Data Security
;
Information and Systems Security
;
Internet Technology
;
Security in Distributed Systems
;
Web Information Systems and Technologies
Abstract:
Blockchain frameworks enable the immutable storage of data. A still open practical question is the so called “oracle” problem, i.e. the way how real world data is actually transferred into and out of a blockchain while preserving its integrity. We present a case study that demonstrates how to use an existing industrial strength secure element for cryptographic software protection (Wibu CmDongle / the “dongle”) to function as such a hardware-based oracle for the Hyperledger blockchain framework. Our scenario is that of a dentist having leased a 3D printer. This printer is initially supplied with an amount of x printing units. With each print action the local unit counter on the attached dongle is decreased and in parallel a unit counter is maintained in the Hyperledger-based blockchain. Once a threshold is met, the printer will stop working (by means of the cryptographically protected invocation of the local print method). The blockchain is configured in such a way that chaincode is e
xecuted to increase the units again automatically (and essentially trigger any payment processes). Once this has happened, the new unit counter value will be passed from the blockchain to the local dongle and thus allow for further execution of print jobs.
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