Security Device Encrypting RTSP Video Data
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Solution Overview
Problem
The transmission of video data through the RTSP protocol is vulnerable to security breaches, as it uses a non-encryption standard, allowing attackers to steal video data from IP cameras by intercepting RTSP packets.
Innovation Solution
An apparatus and method are introduced where a security device encrypts video data between an IP camera and a network video recorder (NVR) using a decryption server, employing public and private key pairs and symmetric keys to secure the transmission, even if one channel's security is compromised, maintaining overall network stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RTSP protocol is used for video data transmission, then ease of operation and network compatibility are improved, but security vulnerability increases allowing packet interception
Solution Approach 1:
The patent introduces a security device as an intermediary component inserted into the RTSP communication path between the IP camera and NVR. This security device intercepts and encrypts video data packets, transforming the insecure RTSP protocol into a secure communication channel without requiring changes to the existing RTSP protocol standard or endpoint devices.
2Object-affected harmful factors
If encryption is implemented for video data transmission, then security is improved, but device complexity increases
Solution Approach 1:
The patent segments the video data transmission system into distinct functional components: the original RTSP communication path (IP camera to NVR) and the security device layer. The security device itself is further segmented into modular functional units including packet interception module, encryption module with public/private key pair management, and packet forwarding module. This segmentation allows encryption functionality to be added without complicating the existing RTSP endpoint devices.
3Reliability
If multiple security channels are established, then security stability is improved through redundancy, but device complexity and key management burden increase
Solution Approach 1:
The patent implements a feedback mechanism where the security device maintains a registry of registered IP cameras and their corresponding public key certificates. When processing video packets, the security device automatically matches the source IP address with registered entries, retrieves the appropriate public key, and performs encryption. This automated feedback-based key selection eliminates manual key management and reduces complexity despite supporting multiple channels.
Solution Approach 2:
The security device autonomously manages its own security operations including automatic key pair generation, certificate creation, IP address registration, and key selection based on packet source identification. The system performs self-service key management without requiring external intervention or complex manual configuration, thereby maintaining security stability across multiple channels while minimizing operational complexity.
Data Source
AI summary
The method comprises 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, 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, and decrypting the private key using the master key provided from the master key management unit.