Partial Image Decryption for Secure Document Viewing
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Solution Overview
Problem
Confidential documents, once decrypted and printed, risk being accessed by unauthorized personnel, as existing encryption methods do not ensure privacy beyond the initial decryption process.
Innovation Solution
A method that captures and decrypts portions of an encrypted image or document using a decryption key, allowing only authorized individuals to view the decrypted content while keeping the entire document encrypted, using a device with image capturing capabilities and displaying the decrypted portions locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire document is decrypted for viewing, then the user can access the information, but the decrypted document can be read by unauthorized personnel or captured through printing
Solution Approach 1:
The document is divided into multiple blocks, and only a subset of blocks is decrypted and displayed at any given time. The decryption key is applied selectively to specific blocks rather than the entire document, ensuring that even if one block is captured, the rest of the document remains encrypted and unreadable.
Solution Approach 2:
Different portions of the document have different encryption/decryption states. The displayed portion is decrypted for viewing, while the remaining portions stay encrypted. This creates a local quality difference where only the necessary portion is accessible, maintaining security for the rest of the document.
2Object-affected harmful factors
If only a portion of the document is decrypted, then unauthorized personnel cannot read the entire document, but the user cannot view the complete information at once
Solution Approach 1:
The system dynamically decrypts and displays different blocks of the document as the user navigates through it. When the user moves to a different portion of the document, the decryption key is applied to the new block, allowing continuous access to complete information while maintaining security for portions not currently being viewed.
Solution Approach 2:
The system prepares multiple encrypted blocks in advance, each ready to be decrypted on demand. The decryption key is held ready to be applied to any block the user navigates to, ensuring that complete information can be accessed sequentially without compromising security of undisplayed portions.
3Ease of operation
If the document is displayed on a screen, then the user can view the information, but someone in the vicinity can spy on the user by looking at the screen
Solution Approach 1:
The displayed information is segmented into small blocks that are decrypted and shown sequentially rather than the entire document at once. This limits the amount of information visible at any moment, reducing the risk of shoulder surfing while still allowing the user to view complete information by navigating through blocks.
Solution Approach 2:
Instead of displaying the complete document at once (excessive action), the system displays only the necessary portion (partial action) that the user needs to view at that moment. This partial display approach maintains usability while minimizing the security risk of screen spying.
Data Source
AI summary
Methods, non-transitory computer readable media and apparatuses for decrypting an image are disclosed. For example, a method captures a portion of an encrypted image and decrypts the portion of the image using a decryption key. The portion of the image contains partial information for an adjacent portion of the image. The method then displays the portion of the image that is decrypted and also displays the adjacent portion of the image using the partial information for the adjacent portion of the image. Another method includes capturing a first portion of an image that is encrypted using a first key and a second key, decrypting the first portion of the image using a first key and displaying the first portion of the image that is decrypted.