Strategy for steganography and information encryption-decryption using Fs laser-created luminescence in organic...

Area of Science:

• Materials Science
• Optics
• Information Security

Background:

• Luminescent materials are key for information security technologies like anti-counterfeiting.
• Current methods face challenges: information leakage, duplication, and environmental sensitivity.

Purpose of the Study:

• To develop a secure, hierarchical information storage and encryption method using tailored photoluminescence.
• To overcome limitations of existing luminescence-based information security techniques.

Main Methods:

• Utilized infrared femtosecond (fs) laser direct writing to create photoluminescence (PL) patterns.
• Applied post-exposure to linearly polarized continuous-wave (CW) laser for polarization-dependent PL anisotropy.
• Demonstrated hierarchical two-level information storage and encryption.

Main Results:

• Achieved level-1 information storage via fs laser-induced PL.
• Concealed level-2 information through polarization-selective bleaching of luminophores.
• Validated the approach on Zeonex polymer and two other organic materials.

Conclusions:

• The developed method offers enhanced security against brute-force attacks and environmental interference.
• This versatile technique advances photoluminescence-based information encryption, decryption, and anti-counterfeiting (IEDAC) technologies.