Yuan Huan, Zhang Bin, Zhong Zheqiang
Opt Express. 2023 Dec 18;31(26):43934-43949. doi: 10.1364/OE.505549.
Metasurface encryption with high concealment and resolution is promising for information security. To improve the encryption security, a polarization-encoded secret sharing scheme based on dielectric metasurface by combining the secret sharing method with nanoprinting and holography is proposed. In this encryption scheme, the secret image is split into camouflaged holograms of different polarization channels and shares a total of 2-1 encryption channels. Benefiting from the secret sharing mechanism, the secret image cannot be obtained by decoding the hologram with a single shared key. Specifically, the secret hologram of a specific channel in the far field can be obtained by specifying the optical key, acquiring the near-field nanoprinting image to determine the combination order for the shared key, and decoding using multiple shared keys. The secret sharing encryption scheme can not only enhance the security level of metasurface encryption, but also increase the number of information channels by predefining camouflage information. We believe that it has important potential applications in large-capacity optical encryption and information storage.
具有高隐蔽性和高分辨率的超表面加密技术在信息安全领域具有广阔的应用前景。为了提高加密安全性，提出了一种基于介质超表面的偏振编码秘密共享方案，该方案将秘密共享方法与纳米打印和全息术相结合。在这种加密方案中，秘密图像被分割成不同偏振通道的伪装全息图，总共共享2-1个加密通道。受益于秘密共享机制，无法通过使用单个共享密钥对全息图进行解码来获取秘密图像。具体而言，通过指定光学密钥、获取近场纳米打印图像以确定共享密钥的组合顺序以及使用多个共享密钥进行解码，可以获得远场中特定通道的秘密全息图。秘密共享加密方案不仅可以提高超表面加密的安全级别，还可以通过预定义伪装信息来增加信息通道的数量。我们相信它在大容量光学加密和信息存储方面具有重要的潜在应用。
