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Dissemination of already protectively marked material may be further limited only to those with a legitimate need to know using compartmentalisation by use of codewords. Examples of compartmented material would include information about nuclear warheads, fusion , and naval nuclear propulsion .
When given a binary message {,} of length , the Hadamard code encodes the message into a codeword () using an encoding function : {,} {,}. This function makes use of the inner product x , y {\displaystyle \langle x,y\rangle } of two vectors x , y ∈ { 0 , 1 } k {\displaystyle x,y\in \{0,1\}^{k}} , which is defined as follows:
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STRAP is a code-word, combined with SECRET or TOP SECRET, to further restrict access to particularly sensitive material. Access is granted to certain holders of Enhanced SC (eSC) or (Enhanced) Developed Vetting (DV/eDV) clearance, allowing them to access SECRET/TOP SECRET STRAP code-word material:
The World War II code word Ultra identified information found by decrypting German ciphers, such as the Enigma machine, and which—regardless of its own significance—might inform the Germans that Enigma was broken if they became aware that it was known. Sensitive Compartmented Information (SCI) and Special Access Programs (SAP)
Several now-retired codewords protected SI compartments based on their sensitivity, generally referred to as Top Secret Codeword (TSC) and Secret Codeword (SC). These codewords were: UMBRA for the most sensitive material
Multiservice tactical brevity code. March 2023 edition cover page of the Multi-Service Brevity Codes. Multiservice tactical brevity codes are codes used by various military forces. The codes' procedure words, a type of voice procedure, are designed to convey complex information with a few words.
D-Day. Daily Telegraph. crossword security alarm. In 1944, codenames related to the D-Day plans appeared as solutions in crosswords in the British newspaper, The Daily Telegraph, which the British Secret Services initially suspected to be a form of espionage.
List of U.S. Department of Defense and partner code names. This is an incomplete list, which may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries. Please observe the definition of the list when adding or editing entries.
Some "code words" are fictitious. In the Sherlock TV series, "Vatican cameos" is used between John Watson and Sherlock Holmes as a code word, initially meaning simply 'duck' or 'get ready.'. Various internet sources offer an erroneous etymology for the phrase, suggesting it dates to World War II.