Audio Data Reproduction System with Encrypted File List Verification
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Solution Overview
Problem
Existing audio data reproduction systems face challenges in preventing fraudulent use of copyrighted audio data, especially on devices with not-so-high performance processors, as they require significant encryption and decryption burdens, making it difficult to secure the data from unauthorized use.
Innovation Solution
An audio data reproduction system that encodes audio files on a transmission device, generates and encrypts a file list, and transmits it along with the encoded files to a receiving device, which decrypts the list and verifies it against stored files, allowing only authorized reproduction of the encoded audio files.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all audio data is encrypted and decrypted to prevent unauthorized use, then security against fraudulent use is improved, but the processing burden on transmission and receiving devices increases significantly
Solution Approach 1:
The patent divides the audio data into two separate components: an encrypted file list (containing metadata and encryption information) and encoded audio files (actual audio data). This segmentation allows the receiving device to only decrypt the small file list rather than all audio data, significantly reducing the decryption burden while maintaining security. The file list contains essential information for verifying and reproducing the audio files without requiring decryption of the audio files themselves.
2Device complexity
If audio data is transmitted without encryption to reduce processing burden, then device complexity is reduced, but security against fraudulent use deteriorates
Solution Approach 1:
The patent extracts the essential security verification information (encryption keys, file metadata, reproduction conditions) from the audio data and places it in a separate encrypted file list. This extracted file list is what requires decryption, while the main audio files remain encoded but not encrypted. This extraction allows the system to maintain security through verification of the file list while avoiding the heavy burden of encrypting all audio data.
3Reliability
If conventional encryption methods are used on devices with not-so-high performance processors, then security is maintained, but the device cannot handle the encryption and decryption burden
Solution Approach 1:
The patent applies partial encryption by only encrypting the file list (a small portion of the total data) rather than all audio data. The file list contains encryption information and metadata that is sufficient for verifying and reproducing the audio files. This partial action approach provides adequate security while keeping the decryption workload within the capabilities of low-performance processors found in electronic dictionaries and similar devices.
Data Source
AI summary
When a PC (a transmission device) transmits an externally taken-in audio file to an electronic dictionary (a receiving device), the PC encodes the audio file and stores the compressed audio file into its own memory temporarily. On the basis of the file management data created by a file management system when the compressed audio file was stored in the memory, the PC generates a file list for the audio files to be transferred. The file list is encrypted using an encryption key. Then, the encryption key, encrypted file list, and compressed audio file are transmitted to the electronic dictionary. The electronic dictionary stores the encrypted file list and compressed audio file into an SD card and decrypts the encrypted file list using the encryption key. When the decrypted file list corresponds to the compressed audio file, the process of expanding the compressed audio file into an audio file is permitted.