Tamper-respondent assemblies with individualized chemical mixtures for security

A tamper-respondent assembly comprising:

• a fluid disposed within a sealed space of the tamper-respondent assembly to secure, at least in part, an electronic component, the fluid comprising a chemical mixture with multiple distinct chemical substances, the multiple distinct chemical substances having randomly generated concentrations within the chemical mixture unique to the tamper-respondent assembly;
• one or more sensors to facilitate detecting a change in the chemical mixture of the fluid indicative of a tamper event into the sealed space of the tamper-respondent assembly;
• and
• a monitor component to monitor one or more sensor signals of the one or more sensors, the monitor component comparing the one or more sensor signals to stored data representative of initially measured random concentrations of the multiple chemical substances of the chemical mixture within the secure volume unique to the tamper-respondent assembly to facilitate detecting the change in the chemical mixture of the fluid indicative of the tamper event.

A method of fabricating a tamper-respondent assembly, the method comprising:

• obtaining a circuit board, the circuit board including an electronic component;
• mounting an enclosure to the circuit board to enclose the electronic component within a secure volume;
• providing, via a fill port into the secure volume, a fluid within the secure volume, the fluid comprising a chemical mixture with multiple different chemical substances, the multiple different chemical substances having randomly generated concentrations within the chemical mixture unique to the tamper-respondent assembly;
• providing one or more sensors to facilitate detecting a change in the chemical mixture of the fluid within the secure volume indicative of a tamper event;
• and
• providing a monitor component to monitor one or more sensor signals of the one or more sensors, the monitor component comparing the one or more sensor signals to stored data representative of initially measured random concentrations of the multiple chemical substances of the chemical mixture within the secure volume unique to the tamper-respondent assembly to facilitate detecting the change in the chemical mixture of the fluid indicative of the tamper event.