Contract Image Creation Using Private Key Encryption
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Solution Overview
Problem
Existing contract creation methods are time-consuming and lack security, particularly when dealing with overseas parties, as they require physical mailing and rely on handwritten signatures for authenticity, which are not considered valid in electronic form.
Innovation Solution
A system that uses private keys for secure contract creation and verification, involving the creation of signature images, enciphering text and signature information, and generating optical marks to create a secure and efficient contract image that can be verified electronically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper contracts with handwritten signatures are used, then contract authenticity is ensured, but contract creation time increases significantly
Solution Approach 1:
The patent creates a digital copy of the handwritten signature (signature image) and encrypts it with the party's private key to generate a digital signature. This allows the contract to be executed electronically without requiring physical mailing and handwritten signatures, thereby reducing contract creation time while maintaining authenticity through cryptographic verification of the signature image
Solution Approach 2:
The patent replaces the mechanical process of physical signature creation and mailing with an electronic system. Instead of physically signing and mailing paper contracts, parties use digital devices to create signature images, encrypt them with private keys, and exchange the encrypted data electronically, eliminating the time-consuming physical processes
2Loss of time
If electronic contracts are used to reduce time, then contract creation time decreases, but security requirements increase
Solution Approach 1:
The patent implements self-service security where each party uses their own private key to encrypt their signature image and the contract text. This distributed encryption approach eliminates the need for a centralized high-security server, as each party independently secures their own data using their private key, thereby reducing security infrastructure costs while maintaining security
Solution Approach 2:
The patent changes the security parameter from requiring high-security servers to using cryptographic encryption with private keys. Instead of relying on secure physical infrastructure, the system uses mathematical encryption parameters (private keys) that are stored locally on each party's device, providing equivalent or superior security with lower infrastructure requirements
3Productivity
If electronic signatures are used instead of handwritten signatures, then contract execution speed increases, but legal validity decreases
Solution Approach 1:
The patent creates a digital copy (signature image) of the handwritten signature and encrypts it with the party's private key. This allows the contract to be executed electronically while preserving the legal validity of handwritten signatures, as the encrypted signature image can be verified to ensure it matches the original handwritten signature
Solution Approach 2:
The patent segments the signature verification process into two parts: (1) creating the signature image from the handwritten signature, and (2) encrypting it with the private key. This segmentation allows the system to maintain the authenticity of handwritten signatures while enabling electronic execution, as the encrypted signature can be verified without requiring physical presentation of the original signature
Data Source
AI summary
A computer-readable recording medium records a contract creation program for creating a contract image of a contract executed by parties each having private key. The program causes a computer to perform steps of: creating, for each party, a signature image of handwritten signature; creating, for each party, signature identification information for identifying the signature image; creating text identification information for identifying contract body text; creating, for each party, an intermediate cipher by enciphering the signature identification information of the party and the text identification information with the private key of the party; creating, for each party, a final cipher by enciphering the signature identification information of the party and the intermediate ciphers of all other parties with the private key of the party; creating an optical mark from each final cipher; and creating the contract image including the text, the signature images, and the optical marks disposed in predetermined columns.