Encrypted Multimedia File Search via Summary Data Segmentation
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Solution Overview
Problem
Users face difficulties in quickly finding specific multimedia files stored on cloud servers due to encryption, as they need to download and decrypt large quantities of files to identify the desired content.
Innovation Solution
A method involving a terminal device that acquires and decrypts encrypted summary information from a server, allowing for the quick identification and retrieval of target multimedia files by matching summary information with encrypted content stored on the server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If users encrypt multimedia files before uploading to cloud server for security, then data security and privacy are ensured, but users cannot quickly search and retrieve specific files from encrypted backups
Solution Approach 1:
The patent segments the multimedia file into two separate parts: encrypted summary information (including file name, type, size, creation time, and encrypted keywords) and encrypted content. The summary information is stored separately from the content, allowing users to search and retrieve files by decrypting only the small summary data rather than downloading entire encrypted files. This segmentation resolves the contradiction by enabling efficient file location while maintaining security.
Solution Approach 2:
The patent introduces an intermediary mechanism - the encrypted summary information acts as a mediator between the user and the encrypted content. Users can decrypt and search summary information to locate desired files without accessing the actual content, and the system uses this summary data to facilitate efficient retrieval. This intermediary approach allows file searching to occur on encrypted data, resolving the contradiction between security and ease of operation.
2Ease of operation
If users download and decrypt large quantities of encrypted multimedia files to find specific content, then complete file access is achieved, but bandwidth and computational resources are wasted
Solution Approach 1:
The patent extracts the essential searchability elements (summary information) from the complete multimedia file and stores them separately. This extracted summary data contains all necessary information for file identification and search (file name, type, size, creation time, and encrypted keywords). Users can perform searches using only this extracted summary information, avoiding the need to download and decrypt entire large files, thus significantly reducing bandwidth and computational resource consumption while maintaining file accessibility.
Solution Approach 2:
Instead of performing the excessive action of downloading and decrypting complete large files to find specific content, the patent enables partial action - downloading and decrypting only the small summary information portion. This partial approach provides sufficient information for file identification and search, avoiding the resource waste of processing complete files while still achieving the goal of locating desired multimedia content efficiently.
Data Source
AI summary
Embodiments of the present disclosure provide a method for searching for a multimedia file, a terminal device, and a server. The method for searching for a multimedia file includes: acquiring, from a server, encrypted summary information of a first multimedia file in at least one multimedia file, where encrypted summary information of the at least one multimedia file corresponds to encrypted content of the at least one multimedia file; decrypting, by a terminal device, the encrypted summary information of the first multimedia file, to obtain summary information of the first multimedia file; when determining that the summary information of the first multimedia file corresponds to a target multimedia file, acquiring, by the terminal device from the server, encrypted content of the first multimedia file corresponding to the summary information of the first multimedia file. According to the embodiments of the present disclosure, a target multimedia file can be quickly found.