Digital Content Transmission via Session Key Authentication
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Solution Overview
Problem
Existing digital content protection technologies, such as HDCP, fail to prevent unintended recipients from receiving digital content due to their locality check protocols, which establish communication with any device that responds within a predetermined time, leading to potential unauthorized transmission.
Innovation Solution
A method and device that display a list of authorized devices within a predetermined radius, detect and select devices with a corresponding session key, and only transmit digital content to those devices, thereby preventing transmission to unselected devices by ensuring a secure session key authentication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locality check protocol establishes communication with any device that sends a response signal within a predetermined time, then the ease of operation is improved, but the security is worsened as digital content may be transmitted to unintended devices
Solution Approach 1:
The patent applies preliminary action by performing session key authentication before establishing content transmission sessions. The sender device authenticates the recipient device using session keys exchanged during the handshake process, and only after successful authentication does it proceed to transmit content. This preliminary security check prevents unintended recipients from receiving content while maintaining ease of operation through automatic authentication.
2Adaptability or versatility
If the HDCP protocol is adopted for wireless and compressed transmission, then the adaptability is improved, but the security is worsened due to the locality check protocol vulnerability
Solution Approach 1:
The patent segments the content transmission process into distinct phases: handshake phase for session key exchange, authentication phase for verifying recipient identity using session keys, and content transmission phase. This segmentation allows the system to maintain the adaptability of HDCP protocol for various transmission types while enhancing security through mandatory authentication in the intermediate phase, preventing the security vulnerability in the original locality check protocol.
3Productivity
If session establishment is allowed with any responding device, then the productivity is improved, but the loss of information is worsened as content may be transmitted to unauthorized devices
Solution Approach 1:
The patent implements feedback by having the recipient device send back its session key in response to the sender's authentication request. The sender device then verifies this received session key against its own local session key. This feedback mechanism ensures that content is only transmitted to authorized devices while maintaining productivity through automatic verification, preventing information loss to unauthorized recipients.
Data Source
AI summary
Disclosed herein are a method and device for transmitting digital content. A selection of at least one device authorized to receive digital content is detected. It is identified whether each selected device contains a session key that corresponds to a local session key. Digital content is transmitted to each device whose session key corresponds to the local key. Digital content is prevented from transmission to unselected devices not having a corresponding session key.