A one-time code is a prearranged word, phrase or symbol that is
intended to be used only once to convey a simple message, often the
signal to execute or abort some plan or confirm that it has succeeded or
failed. One-time codes are often designed to be included in what would
appear to be an innocent conversation. Done properly they are almost
impossible to detect, though a trained analyst monitoring the
communications of someone who has already aroused suspicion might be
able to recognize a comment like "Aunt Bertha has gone into labor" as
having an ominous meaning. Famous example of one time codes include:
Sometimes messages are not prearranged and rely on shared knowledge
hopefully known only to the recipients. An example is the telegram sent
to U.S. President
Harry Truman, then in
Potsdam to meet with Soviet premier
Joseph Stalin, informing Truman of the
first successful test of an
atomic bomb.
- "Operated on this morning. Diagnosis not yet complete but results
seem satisfactory and already exceed expectations. Local press release
necessary as interest extends great distance. Dr. Groves pleased. He returns tomorrow. I will keep you posted."
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- wikipedia.com
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