US 12,238,223 B2
Device and a method for signing a video segment comprising one or more groups of pictures
Stefan Lundberg, Lund (SE); and Viktor Edpalm, Lund (SE)
Assigned to Axis AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Mar. 31, 2022, as Appl. No. 17/710,151.
Claims priority of application No. 21173288 (EP), filed on May 11, 2021.
Prior Publication US 2022/0368534 A1, Nov. 17, 2022
Int. Cl. H04L 9/32 (2006.01); H04N 21/835 (2011.01)
CPC H04L 9/3247 (2013.01) [H04L 9/3239 (2013.01); H04N 21/835 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of signing a video segment comprising one or more groups of pictures, GOPs, each GOP comprising a header and one or more encoded frames, the method comprising:
for each GOP of the one or more GOPs:
producing a GOP hash; and
digitally signing the GOP hash by means of a digital signature, thereby producing a signed GOP hash;
for each GOP except a last GOP of the one or more GOPs, refraining from saving the respective signed GOP hash in any portion of the respective GOP, including the header of the respective GOP, and instead saving the respective signed GOP hash in the header of a subsequent GOP;
adding an additional GOP to the video segment after the last GOP of the one or more GOPs, the additional GOP comprising a header and one or more encoded frames; and
saving the signed GOP hash of the last GOP of the one or more GOPs in the header of the additional GOP.