A desiccant is a moisture-absorbing material used to lower humidity in a sealed container or space. Common examples include silica gel and molecular sieves. In cyber security, desiccants matter because many assets are physical: laptops, backup drives, sensors, radios, and other electronics can be damaged by condensation, corrosion, or mold when they are stored or shipped in damp conditions. Keeping moisture down helps preserve hardware reliability and reduces the chance that equipment fails before it can be imaged, analyzed, or redeployed.
Desiccants appear in defensive workflows such as sealed storage bags for evidence, transit cases for sensitive devices, and cabinets for spare components. They are not a substitute for environmental control, but they help stabilize conditions when humidity cannot be fully controlled. In attacks, moisture control may also be relevant when equipment must survive long transport or hidden storage; defenders can spot poor packaging, condensation, or damaged indicator packs as signs that a device was not kept in proper conditions. The key point is simple: dry storage supports trustworthy hardware, and trustworthy hardware supports trustworthy security operations.