~ 1900 BC: Egyptian writers use non-standard
1500 an enciphered formula for the production of pottery is done in Mesopotamia
parts of the Hebrew writing of Jeremiah's words are written down in "
4th century
487 the Spartans introduce the so called "
170
50-60
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1913 the wheel cipher gets re-invented as a strip
1917
- an AT&T-employee, Gilbert S. Vernam, invents a polyalphabetic cipher machine that works with random-keys
1918 the Germans start using the ADFGVX-system, that later gets later by the French Georges Painvin
- Arthur Scherbius patents a ciphering machine and tries to sell it to the German Military, but is rejected
1919 Hugo Alexander Koch invents a rotor cipher machine
1921 the Hebern Electric Code, a company producing electro-mechanical cipher machines, is founded
1923 Arthur Scherbius founds an enterprise to construct and finally sell his
late 1920's/30's more and more it is criminals who use cryptology for their purposes (e.g. for smuggling). Elizabeth Smith Friedman deciphers the codes of rum-smugglers during prohibition regularly
1929 Lester S. Hill publishes his book Cryptography in an Algebraic Alphabet, which contains enciphered parts
1933-1945 the Germans make the Enigma machine its cryptographic main-tool, which is broken by the Poles Marian Rejewski, Gordon Welchman and Alan Turing's team at Bletchley Park in England in 1939
1937 the Japanese invent their so called Purple machine with the help of Herbert O. Yardley. The machine works with telephone stepping relays. It is broken by a team of
1930's the Sigaba machine is invented in the USA, either by W.F. Friedman or his colleague Frank Rowlett
- at the same time the British develop the Typex machine, similar to the German Enigma machine
1943 Colossus, a code breaking computer is put into action at Bletchley Park
1943-1980 the cryptographic Venona Project, done by the NSA, is taking place for a longer period than any other program of that type
1948 Shannon, one of the first modern cryptographers bringing mathematics into cryptography, publishes his book A Communications Theory of Secrecy Systems
1960's the Communications-Electronics Security Group (= CESG) is founded as a section of Government Communications Headquarters (= GCHQ)
late 1960's the IBM Watson Research Lab develops the Lucifer cipher
1969 James Ellis develops a system of separate public-keys and private-keys
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Advertising as referred to in most economic books is part of the marketing mix. Therefore advertising usually is closely associated with the aim of selling products and services. Still, developments like "branding" show a tendency towards the marketing of not only products and services, but of ideas and values. While advertising activities are also pursued by political parties, politicians and governmental as well as non-governmental organizations, most of the money flowing into the advertising industry comes from corporations. Although these clients come from such diverse fields, their intentions hardly differ. Attempting to influence the public, their main goal is to sell: Products, services, ideas, values and (political) ideology.
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There is no society - in the past or in the present - free of censorship, the enforced restriction of speech. It is not restricted to authoritarian regimes. Democratic societies too aim at the control of the publication and distribution of information in order to prevent unwanted expressions. In every society some expressions, ideas or opinions are feared. Censored are books, magazines, films and videos, and computer games, e.g.
In defence of its monopoly of truth, the Catholic Church published a blacklist of books not allowed to be read: the Index librorum prohibitorum. As indicated by the fact that every declaration of human rights - including the United Nations' Declaration of Human Rights and the
To a high degree the Protestant Reformation was made possible by the invention of the printing press. Now those who were capable of writing and reading no longer needed to rely on the priests to know what is written in the Bible. They could compare the Bible with the sermons of the priests. This may be one of the reasons why especially in countries with a strong Protestant or otherwise anti-catholic tradition (with the exception of Germany), free speech is held in such high esteem.
There seems to be no alternative: free speech without restriction or censorship. But censorship is not the only kind of restriction of speech. Speech codes as politically correct speech are restrictions, sometimes similar to censorship; copyright, accessibility and affordability of means of communication are other ones. Because of such restrictions different to censorship, we cannot think coherently about free speech independently of issues about social justice. Many campaigns for free speech, the right of free expression are backed by the concept of free speech as unconstrained speech. That is perfectly well understood under the auspices of regimes prominently, which try to silence their critics and restrict access to their publications. But the concept of free speech should not solely focus on such constrains. Thinking of free speech as unconstrained speech, we tend to forget to take into account - to campaign against - these other restrictions. Additionally, free expression understood in that way offers no clue how to practice this freedom of expression and what free speech is good for.
In liberal democratic societies censorship is not justified by recurring to absolute truth. Its necessity is argued by referring to personal integrity. Some kind of expression might do harm to individuals, especially to children, by traumatize them or by disintegrating personal morality. Some published information, such as the names of rape victims, might infringe some people's right on privacy or some, as others say, such as pornographic images or literature, e.g., infringes some people's right on equality (how?).
For more information on the history of censorship see
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In 1997 NASA's Cassini mission to Saturn and its moons led to heated controversies, because it was fueled by plutonium, a substance that could cause serious environmental and health problems if it were released into the atmosphere.
Still no major U.S. news outlet in broadcasting or print reported in depth on the risks of the Cassini mission. Westinghouse-owned media like CBS and NBC (also partly owned by General Electric) for example had only reported that children were invited to sign a plaque inside Cassini. Not surprisingly Westinghouse and General Electric are two of the largest corporations with defense contracts and nuclear interests.
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Aeneas Tacitus, a Greek military scientist and cryptographer, invented an optical communication system that combines water and beacon telegraphy. Torches indicated the beginnings and the ends of message transmissions while water jars were used to transmit the messages. These jars had a plugged standard-size hole drilled on the bottom side and were filled with water. As those who sent and those who received the message unplugged the jars simultaneously, the water drained out. Because the transmitted messages corresponded to water levels, the sender indicated by torch signal that the appropriate water level has been reached. It is a disadvantage that the possible messages are restricted to a given code, but as this system was mainly used for military purposes, this was offset by the advantage that it was almost impossible for outsiders to understand these messages unless they possessed the codebook.
With communication separated from transportation, the distant became near.
Tacitus' telegraph system was very fast and not excelled until
For further information see Joanne Chang & Anna Soellner, Decoding Device,
the word "cipher" comes from the Hebrew word "saphar", meaning "to number". Ciphers are mere substitutions. Each letter of the alphabet gets substituted; maybe by one letter or two or more.
an example:
PLAINTEXT a b c d e f g h i j k l m n o p q r s t u v w x y z
CIPHERTEXT D E F G H I J K L M N O P Q R S T U V W X Y Z A B C
Searching for the Balduinist fluorescenting phosphor (Balduinischer Leuchtphosphor), an artificial fluorescent, Johann Heinrich Schulze realized the first photocopies, but does not put them into practical use.
Not before 1843 the first optical photocopier was patented, when William Henry Fox Talbot got granted a patent for his magnifying apparatus.
In 1847 Frederick Collier Bakewell developed a procedure for telecopying, a forerunner of the fax machine. But not before 1902 images could be transmitted. Almost 200 years after Schulze's discovery, for the first time photo telegraphy was offered as telecommunication service in Germany in 1922.
Source: Klaus Urbons, Copy Art. Kunst und Design mit dem Fotokopierer, Köln: Dumont, 1993 (2nd edition)