This article introduces a novel, low-cost technique for hiding data in commercially available resistive-RAM (ReRAM) chips. The data is kept hidden in ReRAM cells by manipulating its analog physical properties through switching ($\textit{set/reset}$) operations. This hidden data, later, is retrieved by sensing the changes in cells' physical properties (i.e., $\textit{set/reset}$ time of the memory cells). The proposed system-level hiding technique does not affect the normal memory operations and does not require any hardware modifications. Furthermore, the proposed hiding approach is robust against temperature variations and the aging of the devices through normal read/write operation. The silicon results show that our proposed data hiding technique is acceptably fast with ${\sim}0.4bit/min$ of encoding and ${\sim}15.625bits/s$ of retrieval rates, and the hidden message is unrecoverable without the knowledge of the secret key, which is used to enhance the security of hidden information.

翻译：本文介绍了一种新颖、低成本的技术，用于在商用电阻式随机存取存储器（ReRAM）芯片中隐藏数据。通过切换操作（$\textit{set/reset}$）操控存储单元模拟物理特性，将数据隐藏于ReRAM存储单元中。随后，通过感知存储单元物理特性的变化（即存储单元的$\textit{set/reset}$时间）来检索这些隐藏数据。所提出的系统级隐藏技术不影响常规存储器操作，且无需任何硬件修改。此外，该隐藏方法具有鲁棒性，能抵抗温度变化以及常规读写操作导致的器件老化。硅基实验结果表明，我们所提出的数据隐藏技术编码速度约为${\sim}0.4bit/min$、检索速率约为${\sim}15.625bits/s$，具有可接受的效率。在未知用于增强隐藏信息安全性的密钥时，隐藏信息无法被恢复。