Physically unclonable cryptographic primitives using self-assembled carbon nanotubes

Area of Science:

• Materials Science
• Information Security
• Nanotechnology

Background:

• Silicon chips face security vulnerabilities like counterfeiting and side-channel attacks.
• Single-walled carbon nanotubes offer potential as a silicon replacement for transistors due to superior electrical properties.
• Challenges in carbon nanotube purity and assembly hinder high-performance electronics.

Purpose of the Study:

• To develop a low-cost, unclonable electronic random structure using carbon nanotube imperfections.
• To enhance information security through novel cryptographic key generation.
• To explore the potential of carbon nanotubes in advanced electronic security applications.

Main Methods:

• Self-assembly of carbon nanotubes into patterned HfO2 trenches via ion-exchange chemistry.
• Optimization of trench width to maximize nanotube placement randomness.
• Creation of two-dimensional (2D) random bit arrays.

Main Results:

• Successfully constructed an unclonable electronic random structure from carbon nanotubes.
• Developed a ternary-bit architecture based on nanotube device connection yield and switching behavior.
• Achieved significantly higher security levels for cryptographic keys compared to conventional binary systems.

Conclusions:

• Carbon nanotube imperfections can be leveraged to create secure, low-cost electronic random structures.
• The developed ternary-bit architecture offers enhanced security for cryptographic applications.
• This approach represents a promising advancement in hardware security for information protection.