Electronic anti-tamper device

An anti-tamper circuit board assembly, comprising:

• a circuit board comprising one or more electronic components;
• wherein the circuit board is provided with a uniform layer that surrounds at least one electronic component to be protected;
• and
• a container having side walls, a first, closed end and a second, opposing, open end, the container being mounted on said circuit board at said open end, onto the uniform layer, over said at least one electronic component, to form a sealed cavity around said at least one electronic component;
• a quantum random source of radioactive particles mounted on an inner surface of the first, closed end of said container;
• an image sensor, provided on the circuit board, for capturing image frames within said sealed cavity, in use, wherein said image sensor comprises a detector region defining an array of pixels wherein, in respect of each pixel, a pixel is made active when the pixel is hit by a radioactive particle from said source;
• and
• a processor, provided on the circuit board, for receiving said captured image frames, monitoring said image frames for changes in a statistical distribution of active pixels and, in an event that the statistical distribution of active pixels indicates a presence of a feature in an image frame, generating a tamper alert.

An anti-tamper assembly for a circuit board comprising one or more electronic components, the assembly, comprising:

• a container having side walls, a first, closed end and a second, opposing, open end, the container being configured to be mounted on said circuit board at said open end, over at least one of said electronic components, to form, in use, a sealed cavity around said at least one of said electronic components;
• a source of radioactive particles mounted within said container;
• an image sensor for capturing image frames within said sealed cavity, in use, wherein said image sensor comprises a detector region defining an array of pixels wherein, in respect of each pixel, a pixel is made active when the pixel is hit by a radioactive particle from said source;
• a processor for receiving said captured image frames, monitoring said image frames for changes in a statistical distribution of active pixels and, in an event that the statistical distribution of active pixels indicates a presence of a feature in an image frame, generating a tamper alert, and
• a power source electrically coupled to the processor and image sensor, the power source being mounted within said container.