New patents are issued by the USPTO on Tuesdays. Today's Spotlight Patents continue the theme of blockchain (distributed ledger, smart contracts) and digital rights management broadly construed. Assigned to Merck (DE) the first patent addresses a reader device for reading a marking comprising a physical unclonable function [see spec and claims for blockchain discussions]. Assigned to Xerox, the second patent addresses techniques for secure revisioning auditing system for electronic document files.
10,275,627, "Reader device for reading a marking comprising a physical unclonable function", assigned to Merck (DE)
The present disclosure relates to the field of anti-counterfeit protection of products. Specifically, the disclosure is directed to a method of reading with a reader device a marking comprising a physical unclonable function, PUF, and a corresponding reader device. In particular, such reader device marking can be used in connection with or can form a component of a multi-component security system, in particular of an anti-counterfeit protection system, which is also disclosed herein as part of an overall security solution for anti-counterfeit protection. The method comprises a stimulation step, wherein a physical challenge according to a predetermined challenge-response authentication scheme corresponding to the PUF is created and applied to a PUF; a detection step, wherein a response generated by the PUF in accordance with the challenge-response authentication scheme in reaction to the challenge is detected and a digital signal representing the response is generated; a processing step, wherein the digital signal is processed in order to generate a hash value of the response by application of a predetermined cryptographic hash function to the digital signal; and an output step, wherein data representing the generated hash value as a first reading result is output.
10,270,600, "Secure revisioning auditing system for electronic document files," assigned to Xerox.
Methods and systems for providing secure recording of revisions made to electronic documents, using secure methods to validate the recorded changes, are disclosed. An electronic device making a change to an electronic document can transmit the change to the network. An audit log chain is residing on the network and shared among all the nodes on the network. A node on the network can verify a change of document made by other nodes and add a new block to the chain using one-way hashes, making the chain resistant to tampering. If an invalid block is detected, the system can send an auditing alert to the network. The audit log can be strongly resistant to tampering, providing reliable evidence for use in audit compliance, investigations, and business or court record keeping.