US 11,943,490 B2
Apparatus and method for maintaining security of video data
Young Sun Park, Seoul (KR); Su Man Nam, Gyeonggi-do (KR); Jin Woo Lee, Seoul (KR); Jun Geol Kim, Gyeonggi-do (KR); Yun Seong Kim, Seoul (KR); and Yoon Jeong Kim, Seoul (KR)
Assigned to DUDU Information Technologies, Inc., Seoul (KR)
Filed by DUDU Information Technologies, Inc., Seoul (KR)
Filed on Jan. 11, 2022, as Appl. No. 17/572,644.
Claims priority of application No. 10-2021-0159491 (KR), filed on Nov. 18, 2021.
Prior Publication US 2023/0156251 A1, May 18, 2023
Int. Cl. H04N 21/2347 (2011.01); H04L 9/08 (2006.01); H04L 9/14 (2006.01); H04L 101/622 (2022.01)
CPC H04N 21/2347 (2013.01) [H04L 9/0822 (2013.01); H04L 9/0825 (2013.01); H04L 9/14 (2013.01); H04L 2101/622 (2022.05)] 5 Claims
OG exemplary drawing
 
1. A method for decrypting video data of a decryption server that comprises a communication unit and a processor connected to the communication unit, the communication unit being connected to a video control device and a plurality of security devices for encrypting video data of photographing devices, the method comprising:
registering at least one of an internet protocol (IP) address and a media access control (MAC) address of the security devices;
generating a plurality of public key and private key pairs;
encrypting and storing private keys comprised in the plurality of public key and private key pairs using a master key provided from a master key management unit, and deleting original data of the private keys;
receiving an access request from the security device;
determining whether or not to approve the access of the security device by comparing at least one of the IP address and the MAC address checked in the access request with information registered in advance;
selecting any one of a plurality of public key and private key pairs when the access of the security device is approved and providing a certificate comprising the selected public key to the security device;
receiving a symmetric key encrypted with the public key of the certificate from the security device;
decrypting the private key using the master key provided from the master key management unit; and
decrypting the encrypted symmetric key using the decrypted private key.