Cross-sectioning is the act of cutting through a specimen so its internal structure can be inspected. In cyber security, the same idea appears in hardware forensics, chip analysis, and reverse engineering, where defenders may physically or logically “slice” through a device, image, or data layer to see what is hidden beneath the surface. The goal is to reveal components, traces of tampering, or design details that are not visible from the outside.
This matters because many attacks rely on concealment. Malicious implants, modified chips, and layered firmware can hide payloads or backdoors inside a trusted-looking system. Cross-sectioning helps analysts confirm whether a device has been altered, identify unusual construction, and compare internal structures against a known-good sample. In practice, it may involve microscopy, decapsulation, or layered image analysis during incident response and supply-chain security work. It is a destructive or invasive method, so it is used when deeper inspection is worth the cost.