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Key-Systems |
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As stated, telecommunication is seen as an unreliable media for transporting secret messages. Therefore today, cryptography is needed more than ever before, especially for e-commerce.
Key cryptosystems try to provide more privacy.
symmetric-key cryptosystems:
The same key is used for both encryption and decryption. In this case the encipherer and the recipient of the message/text have to agree on a common key before the enciphering-process can start. And most of all they should trust each other. And exactly this is the main problem of this system: how to exchange the key without offering an opportunity for stealing it?
In former times messengers or pigeons were doing the exchange of those keys.
Symmetric-key systems make sense in small entities. If a lot of people are spread over a wide area and belong to the same network, distributing the keys starts getting complicated.
Today, those cryptosystems get controlled by other keys, based on highly complex mathematical algorithms.
some symmetric-key systems are:
- DES (Data Encryption Standard), the standard for credit cards
- Triple-DES, which is a variation of DES, encrypting the plaintext three times.
- IDEA (International Data Encryption Standard)
- blowfish encryption algorithm, which is said to be faster than DES and IDEA
Security and confidence are the key-words for a popular key-system: As DES and its successors have been used for so many years and by many people without having been broken, they are considered safe - safer than others, not used that frequently, no matter whether they are actually safer or not.
For further information see:
 http://www.sbox.tu-graz.ac.at/home/j/jonny/projects/crypto/symmetr/content.htm
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1996 WIPO Copyright Treaty (WCT)
The
1996  WIPO
Copyright Treaty, which focused on taking steps to protect copyright
"in the digital age" among other provisions 1) makes clear
that computer programs are protected as literary works, 2) the
contracting parties must protect databases that constitute
intellectual creations, 3) affords authors with the new right of
making their works "available to the public", 4) gives
authors the exclusive right to authorize "any communication to
the public of their works, by wire or wireless means ... in such a
way that members of the public may access these works from a place
and at a time individually chosen by them." and 5) requires the
contracting states to protect anti-copying technology and copyright
management information that is embedded in any work covered by the
treaty. The WCT is available on: http://www.wipo.int/documents/en/diplconf/distrib/94dc.htm
 http://www.wipo.int/documents/en/diplconf/dis...
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