some essential definitions in the field of cryptography are:
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"Few false ideas have more firmly gripped the minds of so many intelligent men than the one that, if they just tried, they could invent a cipher that no one could break." (David Kahn)
The variants of encryption systems are endless.
For deciphering there exists always the same game of trial and error (first guessing the encryption method, then the code). A help to do so is pruning. Once, after a more or less long or short period a code/cipher breaks. Monoalphabetic ciphers can be broken easily and of course are no longer used today but for games.
for further information on codes and ciphers etc. see:
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One of the most critical trends in the western culture what might be called the "fusion of flesh and machine". Increasingly, technological artifacts such as computers, rather than being used as tools by people, are functioning as parts of the human organism. On the other hand, human functionalities such as intelligence, emotion, adaptability or reproductivity are integrated into technological artifacts: the days when computers where only able to count apples and pears and their intelligence was not even matching an insect's are rapidly becoming history. Today, the boundaries between organisms and technology are losing their significance.
As new technologies are no longer mere instruments, or "extensions" of the organism, they acquire the capability of modifying the human organism - body and mind - from within according to certain pre-established principles. The history of the evolution of the human species is hastily being re-written as artificial beings begin to mock the categories of evolution and seem to work their way towards historical subjectivity. The German philosopher Günther Anders has extensively reflected on the changes of the human condition provoked by the development of modern technology speaks of an "antiquatedness of history" at a time when technology itself becomes a historical subject and men are becoming co-historical.
However, the softening of the biological definition of the human race is a theme which has accompanied western thinking ever since its origins. Beings half man-half animal crowd the tales of classical mythology and transcend the boundary between the human from below, while divine creatures, temporarily occupying humanoid bodies, relativise humanness form "above". What exactly "being human" meant and who "human beings" could be "defined" is a question with a long history. "Der Mensch ist das nicht festgestellte Thier" as Nietzsche commented.
Just as the boundaries between human and non-human are being crossed by technological development, so also the boundaries between the classical episteme are becoming permeable. Psychology is occupying itself with the emotions of machines, while physics and cybernetics is applied to the human mind and body. The "nicht festgestellte "character of humanness has meant that imagination has become just as relevant a factor in understanding humanness as science. Science fiction as a literary genre is no longer merely a depository of phantasies about a technisised world our of control. As the human monopoly on history seems to dissolve, the baroque narratives of science fiction have also become a resource for understanding history.
However, it is evident that the potentials of the new technologies gives rise not only to wild hopes and dreams and to bizarre stories; they also harbour some real ambiguities of a political and ethical nature. Not only does the merging of previously distinct realities - the human and the non-human worlds - unhinge theories and institutions based upon a clear distinction and separation of the two, it also is placing political practice on a different footing. Will artificial life have rights? Will artificial entities have political power? How will social relationships change?
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The water-clocks are an early long-distance-communication-system. Every communicating party had exactly the same jar, with a same-size-hole that was closed and the same amount of water in it. In the jar was a stick with different messages written on. When one party wanted to tell something to the other it made a fire-sign. When the other answered, both of them opened the hole at the same time. And with the help of another fire-sign closed it again at the same time, too. In the end the water covered the stick until the point of the wanted message.
The First Amendment to the US Constitution, though short, lists a number of rights. Only a handful of words refer to freedoms of speech and the press, but those words are of incalculable significance. To understand the current subtleties and controversies surrounding this right, check out this First Amendment site. This detailed handbook of legal information, mostly intended for journalists, should be of interest to anyone who reads or writes. For example, the chapter Invasion of Privacy shows the limits of First Amendment rights, and the balance between the rights of the individual and the rights of the public - or, more crudely, the balance of Tabloid vs. Celebrity. Each section is carefully emended with relevant legal decisions.
http://www.rcfp.org/handbook/viewpage.cgi