DTCP-IP Authentication Segmentation for Remote Content Access
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Solution Overview
Problem
Current communication systems face challenges in securely transmitting content through remote access via external networks while adhering to restrictions on round trip delay time (RTT) and hop count (TTL) of an IP router, limiting access to copyrighted content outside the household.
Innovation Solution
A communication system that performs mutual authentication and key exchange without imposing restrictions on RTT and TTL, allowing secure remote access to content by authenticating devices and identifying permitted content for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DTCP-IP protocol is used for content transmission over IP network, then content security is improved through encryption and authentication, but remote access capability deteriorates due to RTT and TTL restrictions
Solution Approach 1:
The patent segments the authentication process into two distinct phases: a registration phase performed within the local network (adhering to DTCP-IP RTT/TTL restrictions) and a remote access phase that occurs outside the household network. This segmentation allows the system to maintain security requirements while enabling remote functionality.
Solution Approach 2:
The patent implements preliminary registration of content using devices within the local network before remote access is permitted. During this preliminary action, the device is authenticated and registered with the content providing device, establishing security credentials in advance. This allows subsequent remote access operations to proceed without being constrained by RTT/TTL limitations.
2Reliability
If RTT and TTL restrictions are imposed on AKE commands, then local network security is maintained, but remote access performance deteriorates
Solution Approach 1:
The patent divides the authentication and access process into two segments: initial registration within the local network where RTT/TTL restrictions apply, and subsequent remote access where these restrictions are lifted. This segmentation resolves the contradiction by applying restrictions only where necessary for security while removing them where they hinder performance.
Solution Approach 2:
The patent changes the operational parameters (RTT and TTL restrictions) based on the operational context. During local registration, strict RTT/TTL parameters are enforced for security. During remote access operations, these parameter constraints are relaxed or removed, allowing faster performance while maintaining security through the pre-established authentication credentials.
3Ease of operation
If content is made accessible remotely, then user convenience is improved, but copyright protection risk increases
Solution Approach 1:
The patent performs preliminary authentication and registration actions within the secure local network environment before permitting remote access. This preliminary security establishment ensures that only authorized devices can access content remotely, thereby maintaining copyright protection while enabling user convenience.
Solution Approach 2:
The patent introduces an intermediary registration process that acts as a mediator between the content providing device and remote accessing devices. This intermediary phase verifies copyrights and authentication credentials locally, creating a security buffer that protects against copyright infringement while still allowing convenient remote access for authorized users.
Data Source
AI summary
To securely transmit content through remote access via an external network, such as a WAN, while exceeding restrictions of an RTT and a TTL.A way of handling a flag for controlling remote access of content is explicitly defined, and an authentication method is explicitly defined when a content using device performs remote access. Thus, also in remote access, similarly to access of the related art in a household, a copyright protection environment of content based on the DTCP-IP is constructed.