随着信息迅速流动和数字通信技术的不断发展，信息安全引起了广泛关注。计算科学与技术的不断突破，对传统加密方法造成了威胁，而光学加密方法则被视为提升信息安全的有效途径。超表面以其在纳米尺度上操纵光学参数的非凡能力而闻名，在光学器件的革命中显示出巨大的潜力，成为光学加密应用的一个非常有前景的候选材料。本文提出了一种具有四个独立调控通道的单尺寸超表面，用于进行图像隐写和多密钥信息加密。本研究中，明文信息首先被转换为一个密文图像，并被编码进超表面的一个信息通道中，而解密密钥被集成到同一超表面的另一通道中；隐写图像具备两个不同的图像揭示密钥，同样被编码到超表面另一对信息通道中，可以通过不同的衍射域位置检索不同的信息通道。这种分布式多密钥加密方法可以提高加密的安全性，同时将图像策略性地分布在不同的空间区域，作为减少信息泄露风险的额外措施。这种极简化设计的超表面具有信息密度高和安全性强等优点，在便携式加密、高分辨率图像显示和高密度光存储等应用中具有前景。

With the escalating flow of information and digital communication, information security has become an increasingly important issue. Traditional cryptographic methods are being threatened by advancing progress in computing, while physical encryption methods are favored as a viable and compelling avenue. Metasurfaces, which are known for their extraordinary ability to manipulate optical parameters at the nanoscale, exhibit significant potential for the revolution of optical devices, making them a highly promising candidate for optical encryption applications. Here, a single-sized metasurface with four independent channels is proposed for conducting steganography and multi-key information encryption. More specifically, plaintext is transformed into a ciphertext image, which is encoded into a metasurface, while the decryption key is discretely integrated into another channel within the same metasurface. Two different keys for steganographic image unveiling are also encoded into the metasurface and can be retrieved with different channels and spatial positions. This distributed multi-key encryption approach can enhance security, while strategically distributing images across distinct spatial zones serves as an additional measure to reduce the risk of information leakage. This minimalist designed metasurface, with its advantages of high information density and robust security, holds promise across applications including portable encryption, high-camouflaged image display, and high-density optical storage.