Selective Encryption for Portable Terminal User Data
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Solution Overview
Problem
Portable terminals pose a risk of personal information disclosure if lost, as existing encryption methods either fail to protect sensitive data or inconvenience users by encrypting all data, necessitating a solution for selective encryption of user data.
Innovation Solution
A method and apparatus for selectively encrypting portions of user data in portable terminals, allowing users to display content, select portions for encryption, and set passwords for encryption, with a controller managing the encryption process and storage of encrypted content and passwords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all user data is encrypted in a portable terminal, then personal information security is improved, but user convenience deteriorates due to the need to decrypt unimportant data
Solution Approach 1:
The patent divides user data into multiple categories (important data requiring encryption and unimportant data accessible without encryption) and applies different encryption treatments to each segment. This allows selective encryption of only sensitive information while leaving other data accessible, resolving the contradiction between security and convenience.
Solution Approach 2:
The patent applies different quality attributes (encryption status) to different parts of the user data based on their importance. Important data is encrypted while unimportant data remains unencrypted, creating local differentiation in data protection levels to balance security requirements with user accessibility needs.
2Ease of operation
If no user data is encrypted in a portable terminal, then user convenience is improved, but personal information security deteriorates
Solution Approach 1:
The system segments user data into protected and unprotected portions, applying encryption only where necessary. This selective approach maintains convenience for accessing unimportant data while ensuring security for sensitive information, preventing the extreme of no encryption at all.
Solution Approach 2:
The patent changes the encryption parameter (encrypted vs. unencrypted state) based on the importance level of different data types. By dynamically adjusting this parameter according to data sensitivity, the system achieves both convenience for general access and security for protected information.
3Ease of operation
If partial user data is encrypted, then user convenience is improved by allowing access to unencrypted data, but security coverage deteriorates compared to full encryption
Solution Approach 1:
The patent implements segmentation of data by importance level, applying encryption selectively to important data while leaving unimportant data accessible. This targeted segmentation optimizes the balance between security coverage and user convenience by protecting only what is necessary.
Solution Approach 2:
The system applies partial encryption action only to the extent necessary for protecting important data, rather than applying full encryption to all data. This partial action approach achieves adequate security coverage for sensitive information while avoiding the inconvenience of encrypting all user data.
Data Source
AI summary
A mobile terminal is capable of performing message encryption. The mobile terminal includes a display unit that can display contents of a message and an input unit that can receive a selection input for a portion of the displayed content. A portion of the displayed content can be selected for encryption. The selected portion of the displayed content is encrypted. The mobile terminal can store the message containing the encrypted content and information regarding the password.