The document outlines a comprehensive End-to-End Data Anti-Tampering Mechanism, structured into four principal categories: Data Acquisition End Encryption, Operation Traceability Management, Data Integrity Verification Mechanism, and Convenient Traceability Query Design.
I. End-to-End Data Anti-Tampering Mechanism
- Data Acquisition End Encryption: The SCADA RC parameter acquisition module employs hardware-level data signatures, ensuring each recorded capacitance value and temperature fluctuation comes with a unique, tamper-proof timestamp.
- Transmission Link Encryption: The communication between the Manufacturing Execution System (MES) and SCADA utilizes the TLS 1.3 protocol, preventing the transmission of calibration data in plaintext and thereby safeguarding against unauthorized tampering.
- Distributed Storage Backup: Calibration data is backed up across three distinct locations: the SCADA local machine, the MES server, and a remote backup node. This redundancy ensures that if data on any single node is compromised, it can be verified and restored from the other two systems.
II. End-to-End Operation Traceability Management
- Hierarchical Access Control: All alterations to RC baseline parameters, as well as manipulations of access permissions, are logged comprehensively. This includes details about the operator's identity, operation time, and parameter changes, ensuring these records are immutable and cannot be deleted.
- Immutable Operation Logs: The operational logs are maintained in a blockchain-like format, where each log block contains a hash of the preceding block, thus rendering historical records secure against modifications. Automatic tagging of abnormal events is also implemented, marking incidents like calibration data exceeding allowable limits, manual unlock actions, and communication disruptions for efficient tracing.
III. Data Integrity Verification Mechanism
- Periodic Hash Value Comparison: The system conducts daily hash value verifications of historical RC calibration data. Detection of tampering triggers immediate auditory and visual alarms to alert personnel.
- Cross-System Data Reconciliation: A daily reconciliation process between MES and SCADA systems ensures consistency in calibration data. Should discrepancies arise, an abnormal work order is generated and escalated to administrators.
- Legal Retention Period: Maintained compliance in the precision injection molding sector, RC calibration data is stored for a minimum of three years, readily exportable for quality audits.
IV. Convenient Traceability Query Design
- One-Click Traceability Dashboard: A specific dashboard in SCADA monitoring allows users to quickly access historical calibration records and unlock logs via a machine number input.
- Linked Data Display: Each calibration record is associated with relevant production work orders and yield data, facilitating quick identification of correlations between parameter changes and product defects.
- Audit Export Function: This feature enables the one-click export of RC calibration reports complete with electronic signatures, making it suitable for customer quality audits and compliance reviews.
