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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 .
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:
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
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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:
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)
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President John F. Kennedy, codename "Lancer" with First Lady Jacqueline Kennedy, codename "Lace". The United States Secret Service uses code names for U.S. presidents, first ladies, and other prominent persons and locations. [1] The use of such names was originally for security purposes and dates to a time when sensitive electronic ...
The decoding process interprets a garbled codeword, referred to as simply a word, as the valid codeword "nearest" the n -letter received string. Mathematically, there are exactly qm possible messages of length m, and each message can be regarded as a vector of length m.
The Douglas A-20 Havoc (company designation DB-7) is an American light bomber, attack aircraft, night intruder, night fighter, and reconnaissance aircraft of World War II . Designed to meet an Army Air Corps requirement for a bomber, it was ordered by France for their air force before the USAAC decided it would also meet their requirements.