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Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
In mathematical terms, the extended binary Golay code G 24 consists of a 12-dimensional linear subspace W of the space V = F 24 2 of 24-bit words such that any two distinct elements of W differ in at least 8 coordinates. W is called a linear code because it is a vector space. In all, W comprises 4096 = 2 12 elements. The elements of W are ...
See the ISO 3166-3 standard for former country codes. British Virgin Islands – See Virgin Islands (British) . Burma – See Myanmar . Cape Verde – See Cabo Verde . Caribbean Netherlands – See Bonaire, Sint Eustatius and Saba . China, The Republic of – See Taiwan (Province of China) . Democratic People's Republic of Korea – See Korea ...
A code word is a word or a phrase designed to convey a predetermined meaning to an audience who know the phrase, while remaining inconspicuous to the uninitiated. For example, a public address system may be used to make an announcement asking for "Inspector Sands" to attend a particular area, which staff will recognise as a code word for a fire or bomb threat, and the general public will ignore.
BATCO. Facsimile of a BATCO cipher sheet. BATCO, short for Battle Code, is a hand-held, paper-based encryption system used at a low, front line (platoon, troop and section) level in the British Army. It was introduced along with the Clansman combat net radio in the early 1980s and was largely obsolete by 2010 due to the wide deployment of the ...
Convolutional code with any code rate can be designed based on polynomial selection; however, in practice, a puncturing procedure is often used to achieve the required code rate. Puncturing is a technique used to make a m/n rate code from a "basic" low-rate (e.g., 1/n) code. It is achieved by deleting of some bits in the encoder output.
Shackle code. A shackle code is a cryptographic system used in radio communications on the battle field by the US military and the Rhodesian Army . It is specialized for the transmission of numerals. Each of the letters of the English alphabet were assigned a numeric value. A number could have several letters assigned.
The Hadamard code is a linear code, and all linear codes can be generated by a generator matrix . This is a matrix such that Had ( x ) = x ⋅ G {\displaystyle {\text{Had}}(x)=x\cdot G} holds for all x ∈ { 0 , 1 } k {\displaystyle x\in \{0,1\}^{k}} , where the message x {\displaystyle x} is viewed as a row vector and the vector-matrix product ...