![]() ![]() NATO SDIP-27 Level C (formerly AMSG 784) and USA NSTISSAM Level III."Laboratory Test Standard for Protected Facility Equipment" This is a slightly relaxed standard for devices that are operated in NATO Zone 1 environments, where it is assumed that an attacker cannot get closer than about 20 m (or where building materials ensure an attenuation equivalent to the free-space attenuation of this distance). NATO SDIP-27 Level B (formerly AMSG 788A) and USA NSTISSAM Level II."Compromising Emanations Laboratory Test Standard" This is the strictest standard for devices that will be operated in NATO Zone 0 environments, where it is assumed that an attacker has almost immediate access (e.g. NATO SDIP-27 Level A (formerly AMSG 720B) and USA NSTISSAM Level I.The US and NATO Tempest standards define three levels of protection requirements: As a joke - but just as factually possible as other attempts - the phrase "Tiny ElectroMagnetic Particles Emitting Secret Things" has been suggested. However, various backronyms have been suggested, including "Transmitted Electro-Magnetic Pulse / Energy Standards & Testing", "Telecommunications ElectroMagnetic Protection, Equipment, Standards & Techniques", "Transient ElectroMagnetic Pulse Emanation STandard", and "Telecommunications Electronics Material Protected from Emanating Spurious Transmissions". government has stated that the term TEMPEST is not an acronym and does not have any particular meaning. The term "Tempest" was coined in the late 1960s and early 1970s as a codename for the National Security Agency operation to secure electronic communications equipment from potential eavesdroppers and vice versa the ability to intercept and interpret those signals from other sources. The term "Tempest" is often used broadly for the entire field of emission security or emanations security ( EMSEC). The term "compromising emanations" rather than "radiation" is used because the compromising signals can, and do, exist in several forms such as magnetic- and/or electric field radiation, line conduction, or acoustic emissions. ![]() The interception/propagation ranges and analysis of such emanations are affected by a variety of factors, e.g., the functional design of the information processing equipment system/equipment installation and, environmental conditions related to physical security and ambient noise. Laboratory and field tests have established that such CE can be propagated through space and along nearby conductors. This energy may relate to the original pre- or non-encrypted message, or information being processed, in such a way that it can lead to recovery of the plaintext. Compromising emanations are defined as unintentional intelligence-bearing signals which, if intercepted and analyzed, may disclose the information transmitted, received, handled, or otherwise processed by any information-processing equipment.Ĭompromising emanations consist of electrical, mechanical, or acoustical energy intentionally or by mishap unintentionally emitted by any number of sources within equipment/systems which process national security information. Tempest (often spelled TEMPEST) is a codename referring to investigations and studies of compromising emanations (CE).
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