<title>Polarization encoding for optical security systems</title>

TLDR

The paper proposes a security verification method for IDs that relies on polarization encoding to make reproduction difficult. The method uses polarization‑encoded information, invisible to standard intensity cameras, and employs a joint transform correlator for optical validation. Simulations and experiments confirm the effectiveness of the proposed polarization‑based security system.

Abstract

An idea for security verification of identification such as passports, credit cards, and others in terms of difficulty of reproduction is proposed. The polarization information is used for security verification. As the state of the polarization encoded cannot be seen by an ordinary intensity sensitive device such as a CCD camera, it cannot be copied. For optical validation system, a joint transform correlator is used. Computer simulations and optical experimental results are shown to confirm our proposed method.