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Shackle Code
A shackle code is a cryptographic system used in radio communications on the battle field by the US military, the Rhodesian Army, and the Canadian Army, among other English speaking militaries which might not distribute or require sophisticated one-time use pads. 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 assignation was changed frequently and required the distribution of the codes to each party in advance. When a party wanted to communicate a number, it radioed "SHACKLE" and it spelled out each digit (or combination of digits) using a word starting with the letter. The end of the number was marked by the word "UNSHACKLE". As an example, suppose the codeword was BLACKHORSE, which has no repeating letters. The starting letter would be expressed as BLACKHORSE4, so the 4th letter would be used for 1 and so on - 1,2,3,4 would be transmitted as C,K,H,O. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptographic System
In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, such as confidentiality (encryption). Typically, a cryptosystem consists of three algorithms: one for key generation, one for encryption, and one for decryption. The term ''cipher'' (sometimes ''cypher'') is often used to refer to a pair of algorithms, one for encryption and one for decryption. Therefore, the term ''cryptosystem'' is most often used when the key generation algorithm is important. For this reason, the term ''cryptosystem'' is commonly used to refer to public key techniques; however both "cipher" and "cryptosystem" are used for symmetric key techniques. Formal definition Mathematically, a cryptosystem or encryption scheme can be defined as a tuple (\mathcal,\mathcal,\mathcal,\mathcal,\mathcal) with the following properties. # \mathcal is a set called the "plaintext space". Its elements are called plaintexts. # \mathcal is a set called th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
US Military
The United States Armed Forces are the Military, military forces of the United States. The armed forces consists of six Military branch, service branches: the United States Army, Army, United States Marine Corps, Marine Corps, United States Navy, Navy, United States Air Force, Air Force, United States Space Force, Space Force, and United States Coast Guard, Coast Guard. The president of the United States is the Commander-in-Chief of the United States, commander-in-chief of the armed forces and forms military policy with the United States Department of Defense, Department of Defense (DoD) and United States Department of Homeland Security, Department of Homeland Security (DHS), both United States federal executive departments, federal executive departments, acting as the principal organs by which military policy is carried out. All six armed services are among the eight uniformed services of the United States. From their inception during the American Revolutionary War, the U.S. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodesian Army
The Rhodesian Security Forces were the military forces of the Rhodesian government. The Rhodesian Security Forces consisted of a ground force (the Rhodesian Army), the Rhodesian Air Force, the British South Africa Police, and various personnel affiliated to the Rhodesian Ministry of Internal Affairs. Despite the impact of economic and diplomatic sanctions, Rhodesia was able to develop and maintain a potent and professional military capability. The Rhodesian Security Forces of 1964–80 traced their history back to the British South Africa Company armed forces, originally created during company rule in the 1890s. These became the armed forces of the British self-governing colony of Southern Rhodesia on its formation in 1923, then part of the Federation of Rhodesia and Nyasaland military in 1953. After the break-up of the Federation at the end of 1963, the security forces assumed the form they would keep until 1980. As the armed forces of Rhodesia (as Southern Rhodesia called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canadian Army
The Canadian Army (french: Armée canadienne) is the command responsible for the operational readiness of the conventional ground forces of the Canadian Armed Forces. It maintains regular forces units at bases across Canada, and is also responsible for the Army Reserve, the largest component of the Primary Reserve. The Army is headed by the concurrently held Commander of the Canadian Army and Chief of the Army Staff, who is subordinate to the Chief of the Defence Staff. The Army is also supported by 3,000 civilian employees from the civil service. Formed in 1855, as the Active Militia, in response to the threat of the United States to the Province of Canada after the British Garrison left for the Crimean War. This Militia was later split into the Permanent Active Militia and the Non-Permanent Active Militia. Finally, in 1940, an Order in Council was issued to rename the active militias to the Canadian Army. On 1 April 1966, prior to the unification of the Canadian Armed For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plaintext
In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. This usually refers to data that is transmitted or stored unencrypted. Overview With the advent of computing, the term ''plaintext'' expanded beyond human-readable documents to mean any data, including binary files, in a form that can be viewed or used without requiring a key or other decryption device. Information—a message, document, file, etc.—if to be communicated or stored in an unencrypted form is referred to as plaintext. Plaintext is used as input to an encryption algorithm; the output is usually termed ciphertext, particularly when the algorithm is a cipher. Codetext is less often used, and almost always only when the algorithm involved is actually a code. Some systems use multiple layers of encryption, with the output of one encryption algorithm becoming "plaintext" input for the next. Secure handling Insecure handling of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Profanity
Profanity, also known as cursing, cussing, swearing, bad language, foul language, obscenities, expletives or vulgarism, is a socially offensive use of language. Accordingly, profanity is language use that is sometimes deemed impolite, rude, indecent, or culturally offensive; in certain religions, it constitutes sin. It can show a debasement of someone or something, or be considered an expression of strong feeling towards something. Some words may also be used as intensifiers. In its older, more literal sense, "profanity" refers to a lack of respect for things that are held to be sacred, which implies anything inspiring or deserving of reverence, as well as behaviour showing similar disrespect or causing religious offense. Etymology The term ''profane'' originates from classical Latin , literally "before (outside) the temple", meaning 'outside' and meaning 'temple' or 'sanctuary'. The term ''profane'' carried the meaning of either "desecrating what is holy" or "with a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
One-time Pad
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is not smaller than the message being sent. In this technique, a plaintext is paired with a random secret key (also referred to as ''a one-time pad''). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. The resulting ciphertext will be impossible to decrypt or break if the following four conditions are met: #The key must be at least as long as the plaintext. #The key must be random ( uniformly distributed in the set of all possible keys and independent of the plaintext), entirely sampled from a non-algorithmic, chaotic source such as a hardware random number generator. It is not sufficient for OTP keys to pass statistical randomness tests as such tests cannot measure entropy, and the number of bits of entropy must be at least equa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trench Code
Trench codes (a form of cryptography) were codes used for secrecy by field armies in World War I. American Army Field Codes In the American Expeditionary Forces During The First World War William Friedman, U.S. War Department, June 1942. Contains many examples in its appendix, including a "Baseball code" (p. 254) Messages by field telephone, radio and carrier pigeons could be intercepted, hence the need for tactical . Originally, the most commonly used codes were simple substitution codes, but due ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Ciphers
Classical may refer to: European antiquity *Classical antiquity, a period of history from roughly the 7th or 8th century B.C.E. to the 5th century C.E. centered on the Mediterranean Sea *Classical architecture, architecture derived from Greek and Roman architecture of classical antiquity *Classical mythology, the body of myths from the ancient Greeks and Romans *Classical tradition, the reception of classical Greco-Roman antiquity by later cultures *Classics, study of the language and culture of classical antiquity, particularly its literature *Classicism, a high regard for classical antiquity in the arts Music and arts *Classical ballet, the most formal of the ballet styles *Classical music, a variety of Western musical styles from the 9th century to the present *Classical guitar, a common type of acoustic guitar *Classical Hollywood cinema, a visual and sound style in the American film industry between 1927 and 1963 * Classical Indian dance, various codified art forms whose theo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numerals
A numeral is a figure, symbol, or group of figures or symbols denoting a number. It may refer to: * Numeral system used in mathematics * Numeral (linguistics), a part of speech denoting numbers (e.g. ''one'' and ''first'' in English) * Numerical digit, the glyphs used to represent numerals See also * Numerology Numerology (also known as arithmancy) is the belief in an occult, divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value, via an alphanumeric system, of the letters in ..., belief in a divine relationship between numbers and coinciding events {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
