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A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...
4 time is usually implied). Sometimes a piece is written with multiple time signatures simultaneously. For example, it might specify 4/4 2/4 3/4 5/4, meaning that the length of measures is irregular and can be 4, 2, 3 or 5 quarter-notes. The time signature of the first measure is always specified first, and the others are placed in increasing ...
[12] During the first quarter of the 20th century, American author and occultist Paul Foster Case established an esoteric musical cryptogram for the purposes of ceremonial magick. The system was a derivative of a cipher used by an affiliated magical order called the Hermetic Order of the Golden Dawn . [ 13 ]
Between Silk and Cyanide by Leo Marks, HarperCollins (1998), ISBN 0-00-255944-7.Marks was the Head of Codes at SOE and this book is an account of his struggle to introduce better encryption for use by field agents. it contains more than 20 previously unpublished code poems by Marks, as well as descriptions of how they were used and by whom.
To decode a message, You apply the same substitution rules, but this time on the ROT13 encrypted text. (Any other character, for example numbers, symbols, punctuation or whitespace, are left unchanged.) Because there are 26 letters in the Latin alphabet and 26 = 2 × 13, the ROT13 function is its own inverse: [2]
Set of expression parsing rules (called grammar) is as follows, Rule1: E → E + E: Expression is the sum of two expressions. Rule2: E → E * E: Expression is the product of two expressions. Rule3: E → number: Expression is a simple number Rule4: + has less precedence than *
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For example, if the last line of a text has a small number, it can be reasonably guessed to be referring to the date, where one of the words means "year" and, sometimes, a royal name also appears. Another case is when the text contains many small numbers, followed by a word, followed by a larger number; here, the word likely means "total" or "sum".