Secure Digital Content Trading via Server-Mediated Key Management
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Solution Overview
Problem
Current encryption methods for secure digital content transmission in wireless commercial environments provide limited control and efficiency for end-users, particularly in managing and transferring digital content, and do not effectively handle billing and compensation transactions.
Innovation Solution
A system where user devices generate and share encryption keys with a server to securely transmit and manage digital content, allowing for peer-to-peer content transfer while enabling billing and compensation transactions through a network of financial institutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symmetric-key encryption is used to secure digital content transmission, then security is improved, but key distribution complexity and device compatibility deteriorate
Solution Approach 1:
The patent introduces a server as an intermediary that generates and manages encryption keys. The server creates a first key for encrypting user device identifiers and a second key for encrypting digital content keys, eliminating the need for direct peer-to-peer key distribution between user devices and reducing key distribution complexity while maintaining security
Solution Approach 2:
The encryption system is segmented into multiple key layers: a first key for device identification, a second key for content encryption, and digital content keys for actual content. This segmentation allows each key to have a specific function and be managed independently through the server, simplifying the overall key management system
2Reliability
If public-key encryption is used to secure digital content transmission, then security is improved, but processing time and computational resources deteriorate
Solution Approach 1:
The server performs preliminary key generation and distribution before actual digital content transmission. User devices receive and store the second key in advance through authentication, so when digital content needs to be transmitted, the encryption and decryption processes are already optimized and do not require time-consuming public-key operations
Solution Approach 2:
The patent replaces public-key encryption mechanics with symmetric-key encryption mechanics for the actual content transmission. The server-generated second key enables efficient symmetric encryption of digital content keys, avoiding the computational overhead of public-key cryptography while maintaining security through the server-mediated key distribution system
3Reliability
If traditional encryption methods are used, then security is improved, but user control over digital content deteriorates
Solution Approach 1:
User devices are empowered to autonomously encrypt and decrypt digital content using the second key received from the server. This self-service capability allows users to control their own digital content without requiring continuous server intervention, improving ease of operation while the server maintains security through key management
Solution Approach 2:
The system dynamically enables user devices to transfer digital content to other user devices by sharing the second key. The server dynamically generates and distributes appropriate encryption keys based on authentication results, allowing flexible user control over content sharing while maintaining security through server-mediated key distribution
4Reliability
If secure digital content transmission is implemented, then security is improved, but network usage costs deteriorate
Solution Approach 1:
The patent extracts the key management function from the network transmission process and places it on the user devices themselves. User devices store the second key locally and use it to encrypt and decrypt digital content keys without requiring continuous network communication with the server, reducing network usage costs while maintaining security through local cryptographic operations
Data Source
AI summary
Systems and methods for securely performing digital commerce. A user device provides a first key and a random number to a server over a first network, encrypts the random number and a user identifier using the first key, and sends the encrypted information to the server via a second network. The server generates an encryption of the random number, the user identifier, and a second key using the first key. The user device receives, decrypts and stores the second key. If the user device wants digital content, the server encrypts the digital content using a digital content key and encrypts the digital content key using the second key. The user device receive the encrypted contents, decrypts the digital content key using the second key and decrypts the digital content using the decrypted digital content key. Digital content can be passed to other user devices.