US 12,445,636 B2
Method and device for signing an encoded video sequence
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. 17/980,138.
Claims priority of application No. 21212291 (EP), filed on Dec. 3, 2021.
Prior Publication US 2023/0179787 A1, Jun. 8, 2023
Int. Cl. H04N 19/46 (2014.01); H04N 19/159 (2014.01); H04N 19/169 (2014.01); H04N 19/172 (2014.01); H04N 19/177 (2014.01)
CPC H04N 19/46 (2014.11) [H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/177 (2014.11); H04N 19/188 (2014.11)] 15 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining an encoded video sequence composed of encoded image frames;
generating a set of one or more frame fingerprints for each encoded image frame, wherein a frame fingerprint is a unique identifier of an encoded image frame, and wherein the frame fingerprint is obtained by:
performing a hashing operation or a checksum operation on the encoded image frame or a subset thereof, or
digitally signing the encoded image frame or a subset thereof with asymmetric cryptography;
generating a document comprising a header of a supplemental information unit, and a representation of the generated sets of one or more frame fingerprints;
generating a document signature by digitally signing the document, wherein the document signature is a digital signature for the document and the digital signature is generated by applying asymmetric cryptography to the document;
generating the supplemental information unit to only consist of the document, the document signature and an indication of an end of the supplemental information unit; and
providing the encoded video sequence with a signature by associating the generated supplemental information unit with the encoded video sequence.