Output Device Connection Using Hash-Based PIN Verification
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Solution Overview
Problem
Existing connection methods between information terminals and projectors are vulnerable to identification code leaks due to wiretapping during communication.
Innovation Solution
A connection method involving generating hash values and identification codes on both the output device and information terminal based on acquired identification information, allowing secure connection without transmitting the PIN code over the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the identification code is transmitted over the network for connection authentication, then the connection process is simplified and automated, but the identification code becomes vulnerable to wiretapping and leakage
Solution Approach 1:
The patent extracts the identification code from the transmission process by using hash values instead. The terminal device generates a hash value from the identification code locally without transmitting the code itself, and the output device verifies this hash value against a pre-stored hash value, thereby eliminating the need to transmit the identification code over the network
Solution Approach 2:
The patent introduces hash values as an intermediary element between the identification code and the authentication process. Instead of directly transmitting or comparing identification codes, the system uses hash values as a mediator that preserves security while enabling verification. The hash value serves as a secure representation that can be transmitted and verified without exposing the original identification code
2Ease of operation
If the identification code is displayed on the projection surface for user input, then the connection can be established through manual entry, but the displayed code may be observed and misused by unauthorized users
Solution Approach 1:
The patent removes the identification code from the display by showing only the hash value to the user. The terminal device displays the hash value instead of the original identification code, and users input this hash value for connection. This extraction ensures that even if someone observes the display, they cannot obtain the original identification code
Solution Approach 2:
The patent uses the hash value as a copy or representation of the identification code for display and input purposes. The hash value is a derived representation that maintains the functional capability for authentication while removing the security risk associated with displaying the original code
Data Source
AI summary
An information terminal that has acquired identification information for identifying an output device generates a hash value based on the acquired identification information. The information terminal generates a first PIN code based on the generated hash value. The output device generates a hash value based on the identification information of the output device and generates and displays a second PIN code based on the hash value. The information terminal receives first input operation for inputting the second PIN code displayed by the output device to the information terminal and transmits a connection request signal to the output device when the second PIN code input to the information terminal and the first PIN code coincide.