cryptography:
It is the study of encryption, the art/science to create and use codes and/or ciphers with the purpose of enciphering as well as deciphering.
After a relatively vivid but slow development of cryptography for nearly 4.000 years the inventions of the telegraph, radio and computer had a high impact on the velocity of further inventions concerning encryption.
Most of the time economic, political or military reasons lie behind the necessity of encryption. As visible from the timetable cryptography it is also done for private and individual interests. An extraordinary example for this is the Braille Code, developed as a possibility for blind people to read and write.
A lot of very interesting and intelligent websites about cryptography can be found in the Internet.Some websites offering links to various cryptography-websites are:
Further there exists a wide range of web-magazines/newsletters/mailing lists on cryptography, e.g.:
Crypto-Gram Newsletter:
Journal of Computer Security:
Cypherpunks:
Stegano-L:
ZD Internet Magazine:
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Media as today's main information sources unarguably have the power to influence political agenda-setting and public opinion. They decide which topics and issues are covered and how they are reported. Still, in many cases those decisions are not primarily determined by journalistic criteria, but affected by external factors. The importance of shareholders forces media to generate more profit every quarter, which can chiefly be raised by enlarging audiences and hence attracting more advertising money. Therefore the focus of media's programming in many cases shifts towards audience alluring content like entertainment, talk-shows, music and sports.
Further pressure regarding the selection of content occurs from advertisers and marketers, who often implicitly or explicitly suggest to refrain from programming which could show them or their products and services (e.g. tobacco) in an unfavorable light. Interlocking directorships and outright ownerships can moreover be responsible for a selective coverage. Financial connections with defense, banking, insurance, gas, oil, and nuclear power, repeatedly lead (commercial) media to the withholding of information, which could offend their corporate partners. In totalitarian regimes also pressure from political elites may be a reason for the suppression or alteration of certain facts.
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The Internet can be used in in different ways: for distributing and retrieving information, for one-to-one, one-to-many and many-to-many communication, and for the access services. Accordingly, there are different services on offer. The most important of these are listed below.
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900 B.C.
A postal service is used for governmental purposes in China.
500 B.C.
In ancient Greece trumpets, drums, shouting, beacon, fires, smoke signals, and mirrors are used for message transmission.
4th century B.C.
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 a message transmission 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 a torch signal that the appropriate water level had been reached. The methods disadvantage was that the possible messages were restricted to a given code, but as the system was mainly used for military purposes, this was offset by the advantage that it was almost impossible for outsiders to understand the 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,
3rd century B.C.
Wax tablets are used as writing material in Mesopotamia, ancient Greece, and Etruria.
2nd century B.C.
In China paper is invented.
1st century B.C.
The use of codices instead of scrolls - basically the hardcover book as we know it today - is an essential event in European history. To quote accurately by page number, to browse through pages and to skip chapters - things that were impossible when reading scrolls - becomes possible.
In the computer age we are witnesses to a kind of revival of the scrolls as we scroll up and down a document. The introduction of hypertext possibly marks the beginning of a similar change as has taken place with the substitution of scrolls with codices.
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The skytale (pronunciation: ski-ta-le) was a Spartan tool for encryption. It consisted of a piece of wood and a leather-strip. Any communicating party needed exactly the same size wooden stick. The secret message was written on the leather-strip that was wound around the wood, unwound again and sent to the recipient by a messenger. The recipient would rewound the leather and by doing this enciphering the message.
Authors of copyrighted works (besides