ARLA/CLUSTER: Os segredos das radios estações de numeros

[João Costa > CT1FBF]

Secret Radio Stations by the Numbers

On Hackaday radio amateur *Al Williams WD5GNR* writes about secret number
stations and how to receive them

There are actually several types of number stations, but the prototypical
one is simply someone on the air reading lists of numbers (or sending them
via Morse code). Some read off other coded messages (like phonetic alphabet
letters) or have sounds in the background that may or may not be
digitally-encoded messages. One even used a sound clip from a Yosemite Sam
cartoon to separate bursts of data.

There are dedicated groups that try to locate them and even decode what
they are saying. However, it is thought that most of them use some form of
one time pad cryptography which makes trying to decode them a very long
shot. It is pretty widely accepted, though, that the purpose of most (if
not all) of these stations is to deliver clandestine messages.

Read the full story at
http://hackaday.com/2015/10/29/secret-radio-stations-by-the-numbers/
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