Revocation List Generation Device Data Size Reduction
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Solution Overview
Problem
As the number of revoked public key certificates increases, the data size of the revocation list also grows, leading to constraints on recording media capacity and network load, making it difficult to distribute content effectively.
Innovation Solution
A revocation list generation device that acquires and generates a list only including identifiers for revoked public key certificates associated with specific content, reducing the overall data size by excluding unnecessary identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the revocation list includes all revoked public key certificate identifiers, then the completeness of revocation information is improved, but the data size of the revocation list increases
Solution Approach 1:
The patent divides the revocation list into multiple separate lists, where each list corresponds to a specific content item and contains only the revocation identifiers relevant to that content. This segmentation allows each list to remain small while collectively providing complete revocation information across all content items.
Solution Approach 2:
The patent applies local quality by making each revocation list tailored to specific content requirements. Instead of a single comprehensive list, each content item receives a customized revocation list containing only the identifiers of revoked certificates relevant to that content, optimizing the data size for each local use case.
2Quantity of substance
If the revocation list data size is reduced, then the recording medium capacity is improved, but the completeness of revocation information may be compromised
Solution Approach 1:
By segmenting the revocation information into separate lists for each content item, the system reduces the data size for each individual list while maintaining completeness within the context of each content item's relevant revocations.
Solution Approach 2:
The patent transitions from a single-dimensional comprehensive list to a multi-dimensional structure where revocation information is organized by content item. This dimensional change allows the system to provide complete information relevant to each content item without requiring a single large list.
3Productivity
If the revocation list is distributed across the network, then the content distribution is improved, but the network load increases
Solution Approach 1:
The patent segments the revocation list distribution by attaching individual revocation lists to specific content items during content distribution. This means only the necessary revocation information for each content item is transmitted over the network, reducing overall network load while maintaining distribution efficiency.
Solution Approach 2:
The patent extracts only the necessary revocation identifiers relevant to each content item and attaches them to that content during distribution. This extraction approach ensures that unnecessary revocation information is not transmitted over the network, reducing network load while maintaining the essential functionality of content distribution.
Data Source
AI summary
Provided is a revocation list generation device that can suppress an increase in the amount of data of a revocation list. A revocation list generation device that generates a revocation list includes an acquisition unit that acquires, for a content, a revocation identifier identifying a revoked public key certificate allocated to an apparatus related to use of the content, a revocation list generation unit that generates a revocation list including the acquired revocation identifier associated with the content, and an output unit that outputs the revocation list.