Method and system for creating and checking the validity of device certificates

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United States of America Patent

PATENT NO 11743054
APP PUB NO 20210044441A1
SERIAL NO

17077951

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Abstract

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To easily identify an invalid device certificate by means of a validity check when signing keys that are used to create device certificates are compromised, a piece of status information is provided for device certificates that comprises positive evidence of the existence and validity of the device certificate, and alternatively or additionally to apply a special validity model for device certificates, wherein the time of issue of the device certificate is documented by means of a signed electronic timestamp, and wherein a different signing key is used for signing the timestamp than for signing the device certificate. Additionally, all information that is required for the validity check of a device certificate is stored in a memory of the device or in a memory associated with the device, so that an identity check on the device can be performed at any time without fetching additional data.

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Patent Owner(s)

Patent OwnerAddress
PHOENIX CONTACT GMBH & CO KGFLACHSMARKTSTR 8 BLOMBERG 32825

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nitschke, Torsten Dortmund, DE 4 47

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