What is a Faraday enclosure?
A Faraday enclosure is an enclosure made of electrically conductive materials which is thereby designed to reduce electromagnetic signals passing between its interior and the surrounding environment. When appropriately designed and constructed, it can significantly protect against wireless communications such as cellular, Wi-Fi, Bluetooth and other radio-frequency signals.
Explanation
A Faraday enclosure works by surrounding a protected space with electrically conductive material. Incoming electromagnetic energy interacts with the conductive surface, reducing the strength of radio-frequency signals that can penetrate the enclosure.
The effectiveness of a Faraday enclosure depends on several factors, including the conductive material used, the frequencies involved, the continuity of the shielding and the design of openings, seams, doors and other potential leakage points.
A practical Faraday enclosure therefore involves more than simply placing conductive material around an object. Gaps or poorly shielded openings can significantly affect its performance.
Faraday shielding prevents – or at worst, greatly diminishes – wireless and electromagnetic communication. It does not, by itself, prevent a device inside the enclosure from operating locally or using functions that do not require an external wireless connection.
Why it matters
Smartphones and other connected devices contain multiple wireless technologies capable of communicating with external networks and other nearby devices.
In environments where confidential or security-sensitive information is being discussed, controlling those communication paths is an essential element of a broader device-security strategy.
A Faraday enclosure can provide a physical method of reducing wireless connectivity without relying solely on controlling the settings or configuration of each individual device. This will provide a more consistent level of control where stronger confidentiality is important.
Practical considerations
The performance of a Faraday enclosure should be considered in relation to the frequencies and wireless technologies that need to be controlled. Its shielding effectiveness will vary considerably depending on construction, materials and the integrity of the enclosure.
Particular attention must be given to openings, seams and other discontinuities in the conductive barrier, as these can impair the enclosure’s effectiveness..
Wireless isolation should also not be confused with protection against local audio recording. A smartphone that cannot communicate with an external network may still be capable of processing or storing information locally. Where both wireless communication and audio capture are concerns, they need to be addressed as separate security risks, and you need a solution that addresses both, such as MuteCase.