Tiger Amulet inspired high-security holographic encryption via liquid crystals

Area of Science:

• Optics and Photonics
• Materials Science
• Information Security

Background:

• Holographic encryption using metasurfaces and liquid crystals (LCs) offers precise phase control but faces security vulnerabilities.
• Existing methods are susceptible to exhaustive attacks and information disclosure even if parts of the hologram are compromised.
• There is a need for improved security in holographic data encryption.

Purpose of the Study:

• To propose a simple yet effective holographic encryption method inspired by ancient Chinese Tiger Amulets.
• To design a secure "four-in-one" hologram utilizing photopatterned LCs.
• To enhance information hiding and image encryption security.

Main Methods:

• Development of a "four-in-one" hologram composed of photopatterned liquid crystals.
• Implementation of a specific splicing order for the four LC holograms to display the primary encrypted image.
• Utilizing external voltages to tilt LC directors and modulate holographic efficiency.

Main Results:

• The primary encrypted image is only revealed when all four LC holograms are correctly assembled in the designated order.
• Incorrect assembly or separate use of holograms displays camouflage information, not the secret data.
• Adjustable holographic efficiency via external voltage further increases decryption complexity and security.

Conclusions:

• The proposed holographic encryption scheme offers a significant improvement in security over existing methods.
• The "four-in-one" LC hologram design provides high security and low crosstalk for information hiding.
• This method demonstrates potential for advanced applications in secure data storage and image encryption.