Multicomponent reactions provide key molecules for secret communication.

Area of Science:

• Chemistry
• Cryptography
• Information Security

Background:

• Advanced encryption standard cryptography offers secure digital communication.
• Molecular steganography presents a novel approach for non-digital information hiding.
• The need for diverse molecular structures for secure keys necessitates efficient synthesis methods.

Purpose of the Study:

• To introduce a secure communication channel by combining cryptography with molecular steganography.
• To develop a combinatorial method for synthesizing a large database of molecular keys.
• To demonstrate the non-digital transfer and re-isolation of molecular keys.

Main Methods:

• Utilizing the Ugi four-component reaction with perfluorinated acids to create molecular keys.
• Establishing a database of 130 commercially available components for combinatorial synthesis.
• Employing adsorption and dissolution for non-digital concealment of molecular keys.
• Using high-resolution tandem mass spectrometry for molecular structure determination.

Main Results:

• A combinatorial approach generated 500,000 unique molecular keys from 130 components.
• Molecular keys were successfully concealed and re-isolated from various non-digital mediums like paper, coffee, tea, sugar, perfume, and blood.
• Perfluorinated sidechains simplified the re-isolation and purification process.
• High-resolution tandem mass spectrometry unequivocally identified molecular structures for decryption.

Conclusions:

• The Ugi reaction provides a versatile platform for generating diverse molecular keys for secure communication.
• Non-digital transfer and recovery of molecular keys are feasible, enhancing communication security.
• This integrated approach of molecular keys and mass spectrometry offers a robust system for secure, non-digital data encoding and decryption.