Stability and Specificity of Counterfeit Protection System Code.

Area of Science:

• Forensic Science
• Document Examination
• Information Security

Background:

• Counterfeit protection systems (CPS) are crucial for verifying document authenticity.
• Assessing the long-term stability and specificity of CPS codes is essential for their reliable application.
• Previous research has focused on the detection of counterfeit documents, but long-term stability studies of CPS codes are limited.

Purpose of the Study:

• To determine the stability and specificity of counterfeit protection system (CPS) codes over time.
• To analyze the durability of CPS code characteristics under real-world conditions.
• To evaluate the reliability of CPS codes for anti-counterfeiting measures.

Main Methods:

• Collected 379 sample sheets from 196 printers/photocopiers across 14 brands and 129 models.
• Employed the pattern location measurement method to analyze CPS code units over time.
• Established four key characteristics: CPS pattern unit, unit distance, dot position, and dot size/shape.

Main Results:

• CPS code characteristics exhibited stability over time, with no significant changes observed in most brands.
• Partial changes were noted in the Xerox brand, but overall CPS stability was confirmed.
• No correlation was found between combinations of characteristic systems, indicating high specificity.

Conclusions:

• The study confirms the inherent stability of CPS codes, making them a reliable tool for counterfeit detection.
• The high specificity of CPS characteristics ensures accurate identification and reduces the risk of false positives.
• CPS codes are a robust security feature, with potential for widespread application in document authentication.