Self-Assembled Resonance Energy Transfer Keys for Secure Communication over Classical Channels

Area of Science:

• Materials Science
• Cryptography
• Nanotechnology

Background:

• Modern security relies on physical keys for unforgeable signatures, moving beyond software-based methods.
• Quantum key distribution offers unforgeable keys but faces limitations in distance and infrastructure costs.

Purpose of the Study:

• To develop a practical and secure method for creating unclonable physical keys.
• To enable secure authentication and communication over classical channels without distance limitations.

Main Methods:

• Utilizing molecular self-assembly to create resonance energy transfer (RET) devices as physical keys.
• Demonstrating the infeasibility of cloning RET-keys due to characterization challenges, numerous input-output combinations, and temporal response variations.

Main Results:

• Legitimate users achieved 99.48% authentication success with only 0.39% false positives over two attempts.
• Estimated computational advantage for legitimate users over attackers exceeds 10^340 years.
• Successful authentication and communication over classical channels are enabled.

Conclusions:

• The developed RET-key method provides a practical and highly secure alternative for authentication and communication.
• This approach overcomes the limitations of quantum key distribution, enabling secure communication over any distance.
• Facilitates the development of new physical key-based multiparty authentication and communication schemes with unprecedented security.