US 12,348,737 B2
Methods of adding and validating a digital signature in a video data segment
Björn Völcker, Lund (SE); and Stefan Lundberg, Lund (SE)
Assigned to AXIS AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Nov. 3, 2022, as Appl. No. 17/980,150.
Claims priority of application No. 21213608 (EP), filed on Dec. 10, 2021.
Prior Publication US 2023/0188732 A1, Jun. 15, 2023
Int. Cl. G06F 21/62 (2013.01); G06F 21/64 (2013.01); H04L 9/32 (2006.01); H04N 19/172 (2014.01)
CPC H04N 19/172 (2014.11) [G06F 21/6209 (2013.01); G06F 21/64 (2013.01); H04L 9/3247 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for verifying a digital signature in a video data segment, wherein the video data segment is generated by a video delivery chain defined by a video capturing device and a plurality of node devices, comprising:
obtaining the video data segment, the video data segment comprising encoded image frames, generated by the video capturing device, and a plurality of node device datasets successively generated and added to the video data segment by the plurality of node devices,
wherein the plurality of node device datasets are associated with respective labels from which an order in which the plurality of node device datasets have been added to the video data segment is derivable,
wherein one or more node device datasets in the plurality of node device datasets include respective digital signatures of which at least one is generated based on parts of the encoded image frames,
wherein the one or more node device datasets comprises a first node device dataset which includes a first digital signature generated by a first node device based on a first number of node device datasets of the plurality of node device datasets that have been last added to the video data segment before the first node device dataset,
locating the labels in the obtained video data segment,
identifying, using the labels, the first number of node device datasets that have been last added to the video data segment before the first node device dataset, and
verifying the first digital signature based on the identified first number of node device datasets.