Patent ID: 11882214
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. A method of controlling cryptographic document protection, the method being performed by a device that is associated with a device identifier (Device ID) and with a cryptographic key (private key, KsNAF) and comprising:
obtaining an electronically processable document representation, EPDR (H2), of content of a document that is to be protected;
applying the cryptographic key (private key, KsNAF) to the EPDR (H2) to obtain a cryptographically processed document representation, CPDR (S2);
transmitting the device identifier (Device ID) and a verification parameter comprising at least one of the EPDR (H2) and the CPDR (S2) towards a transaction server that is configured to log the device identifier (Device ID) and the verification parameter (H2, S2) in a tamper-proof manner;
receiving a transaction identifier (TRX ID) associated with the device identifier (Device ID) and the verification parameter (H22, S2); and
triggering printing of the transaction identifier (TRX ID) and the CPDR (S2) on a physical document that corresponds to the EPDR (H2).