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The NSA's EMF equipment can tune in RF emissions from personal
computer circuit boards (while filtering out emissions from monitors
and power supplies). The RF emission from PC circuit boards contains
digital information in the PC. Coded RF waves from the NSA's equipment
can resonate PC circuits and change data in the PC's.
It would be rather more prudent if we can send the secret information, either in plaintext or ciphertext, by cleverly embedding it as part of a cover media (for example, an image, audio or video carrier file) in such a way that the hidden information cannot be easily perceived to exist for the unintended recipients of the cover media. This idea forms the basis for Steganography,
which is the science of hiding information by embedding the hidden (secret) message within other, seemingly harmless images, audio, video files or any other media. Steganography protects the intellectual property rights and enables information transfer in a covert manner such that it does not draw the attention of the unintended recipients.
Non-lethal weapons is a broad category which includes devices for beaming various kinds of energy at human targets in order to temporarily incapacitate them, or to control or affect their behavior. Non-lethal weapons research has been conducted at universities on contract to the CIA, and has overlapped with research on hallucinogens and brain electrode implants. BB 103
In 1991, Janet Morris, one of the main proponents of non-lethal weapons, issued a number of papers.  According one paper, US Special Operations Command already had a portable microwave weapon. “US Special Forces can cook internal organs.”  Another concept was ‘Infrasound’ using acoustic beams. Laboratories were developing a high power, very low frequency acoustic beam weapon projecting non-penetrating acoustic bullets. Already, some governments have used infrasound as a means of crowd control. Very low frequency (VLF) sound, or low frequency RF modulations can cause nausea, vomiting and abdominal pains. “Some very low frequency sound generators can cause the disruption of human organs and, at high power levels, can crumble masonry.”  MC 176-179