What is RÖS? What is Tempest? What is Shielded Enclosure? What is SN2 and SN3?

- RÖS and Tempest both address leaking emanations.
- RÖS is a Swedish term.
- Tempest is an international term.
- We use the term Shielded Enclosure (SE) for Tempest 10 GHz/100 dB.
- SN2 and SN3 are the Swedish Armed Forces’ rating of physical shell protection.

Leaking emanations occur when information is disclosed unintentionally because all electronic equipment generates electromagnetic radiation that can be intercepted and read.

RÖS protection is achieved by “Faraday-caging” the protected area, in other words surrounding the area with a shield in the form of an electrically continuous metal casing. To prevent leaking emanations from wires, all electrical and telecommunication wires with a metallic conductor must be fitted with special filters. Data is transmitted over fibre optic cables without a metallic sheath, which enter the metallic
shield through special openings.

The openings are called wave traps and are configured as tubes with a diameter and length determined by the intended protection class. Target Enclosure® SN2 and SN3 cabinets satisfy Safety Levels 2 and 3 respectively regarding mechanical break-in protection, according to the applicable standards SN2- FSD0260 and SN3-SSF3492.

The difference between Safety Levels 2 and 3 is the effective attack time for different threat
scenarios and tools that the cabinet is able to withstand. SN3 is the strongest. The Target Enclosure® SN2SE and SN3SE are IT security cabinets that meet the same physical requirements as SN2 and SN3 but also satisfy the highest international TEMPEST rating of 10 GHz/100 dB, according to the applicable standards EN50147 and NSA94-106. We have chosen to call this highest rating Shielded Enclosure (SE).
If you have an SS1-rated RÖS room and would like to upgrade to a higher standard of protection, you could save a lot of time and money by simply installing some Target Enclosure® SE cabinets instead.