Content Authorization via Update Information Feedback Loop
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Solution Overview
Problem
In conventional DTCP-IP-based content transmission systems, there is a challenge in verifying whether received content is authorized, as unauthorized devices can masquerade as the transmitter, leading to unauthorized content being used by the receiver.
Innovation Solution
The proposed solution involves a method where the transmitter attaches updated update information to encrypted content and verifies its authenticity through a message-of-acceptance mechanism, ensuring only authorized content is received and utilized by the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DTCP-IP-based transmission system is used, then content can be transmitted over network, but unauthorized devices can masquerade as transmitter leading to unauthorized content usage
Solution Approach 1:
The transmitter sends update information to the receiver, and the receiver feeds back verification requests containing this update information. The transmitter verifies the feedback and sends acceptance messages, creating a closed-loop verification system that ensures content authorization authenticity
Solution Approach 2:
The transmitter attaches update information to encrypted content components before transmission. This preliminary action enables the receiver to perform authorization verification before utilizing the content, preventing unauthorized content usage in advance
2Reliability
If update information is attached to encrypted content for verification, then content authorization can be verified, but communication overhead increases
Solution Approach 1:
The verification mechanism extracts only the essential update information from the content transmission process. This update information is separately attached to encrypted content components, allowing verification without transmitting entire content components multiple times, thus minimizing communication overhead
3Reliability
If message of acceptance mechanism is implemented, then unauthorized content usage is prevented, but system complexity increases
Solution Approach 1:
The verification process is segmented into distinct steps: the transmitter attaches update information, the receiver sends verification requests containing this information, and the transmitter responds with acceptance or rejection messages. This segmentation makes the complex verification process more manageable and implementable
Data Source
AI summary
In a system which attaches update information required to create a content key used for content encryption/decryption to encrypted content and transmits the encrypted content, there is used an authorized content verification method including a verification request step of, by a receiver, transmitting an authorization verification request including update information received from a transmitter, an update information check step of, by the transmitter, checking whether the update information included in the received authorization verification request is predetermined update information, a message-of-acceptance transmission step of creating a message of acceptance using the update information and an exchange key shared between the transmitter and the receiver and transmitting the message of acceptance if the update information matches the predetermined update information, and an authorized content determination step of, by the receiver, determining that content is authorized content on the basis of reception of the message of acceptance.