KAIST Develops Transistor-Based Encryption That Controls When Information Can Be Read (IMAGE)
Caption
Figure 1. Overview of the dual-state programmable oxide transistor (DUPOT) and concept of time-based cryptography
The device shows either long-term or short-term memory characteristics, depending on the polarity of the voltage applied to its gate. Long-term memory is achieved by adjusting the threshold voltage through charge trapping, and short-term memory is achieved by adjusting the saturation current through ion migration at the interface. In other words, the device has two “programmable” states: the threshold voltage and the saturation current. When these two operating characteristics are extended to an array, time-based encryption can be implemented, in which predefined letters appear only at specific times.
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KAIST
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