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<p>It remains a huge challenge to achieve time-gated information encryption and decryption in the traditional phase transition gel platforms. Herein, we design and report a photocleavable gel that allows for time-gated information encryption and decryption, thereby enhancing security for information storage. The gel is synthesized by copolymerization of hydrophobic <i>ortho</i>-nitrobenzyl acrylate (NA) and acrylamide. Upon ultraviolet irradiation, the hydrophobic NA units within the gel network are capable of partial cleavage to yield orange-colored <i>o</i>-nitrosobenzaldehyde (NSBA) molecules and hydrophilic acrylic acid groups, which changes both the local color and hydrophilicity of the gel. As a result, information can be spatially encoded using a photomask. The written information at the surface of the gel is encrypted by dissolving NSBA molecules in dimethyl sulf-oxide. Upon aqueous immersion, the distinct hydrophilic properties between irradiated and non-irradiated zones trigger the localized phase separation, thereby facilitating the decryption of the embedded data. Notably, the photolysis kinetics is a time-gated process, ensuring that the encrypted information can only be decrypted within a specific time-gated window in water. This method surpasses the constraints of traditional gels, offering a novel paradigm for enhanced secure information storage.</p>

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Photocleavable gel platforms for time-gated information encryption and decryption

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Xiaxin Qiu,
  • Jiayi Liu,
  • Mengda Xu,
  • Lidong Zhang

摘要

It remains a huge challenge to achieve time-gated information encryption and decryption in the traditional phase transition gel platforms. Herein, we design and report a photocleavable gel that allows for time-gated information encryption and decryption, thereby enhancing security for information storage. The gel is synthesized by copolymerization of hydrophobic ortho-nitrobenzyl acrylate (NA) and acrylamide. Upon ultraviolet irradiation, the hydrophobic NA units within the gel network are capable of partial cleavage to yield orange-colored o-nitrosobenzaldehyde (NSBA) molecules and hydrophilic acrylic acid groups, which changes both the local color and hydrophilicity of the gel. As a result, information can be spatially encoded using a photomask. The written information at the surface of the gel is encrypted by dissolving NSBA molecules in dimethyl sulf-oxide. Upon aqueous immersion, the distinct hydrophilic properties between irradiated and non-irradiated zones trigger the localized phase separation, thereby facilitating the decryption of the embedded data. Notably, the photolysis kinetics is a time-gated process, ensuring that the encrypted information can only be decrypted within a specific time-gated window in water. This method surpasses the constraints of traditional gels, offering a novel paradigm for enhanced secure information storage.