Key or symmetrical key encryption technique
(Secret-Key or Symmetric-Key Cryptography)
The key encryption technique is guaranteed that has the text to decipher the key to limit the side to the information public networking safety work. In the key encryption pattern, only needs to provide one kind of key to carry on Canadian, the decipher process. It is called the symmetrical key encryption. “the asymmetrical key encryption” mainly applies in needs a group of public/personal key's system: When text encryption uses one kind of key, when the decipher uses another kind of key.
The key appears the form has many kinds, like code, password or other. The most popular key encryption technology is the des (DES:Data Encryption Standard). The current use are more, and the more advanced encryption algorithm is Triple DES, supports the high sensitive information the security. In the key encryption's core technologies are the key managements, including the key establishment, the key storage, the key allocation, the key cancels and so on. The financial industry is in the dominant position in the standardized key protection and in the exchange process. The actual content financial organ key management (Wholesale) in the standard has the explanation in ANSI the X9.17. At present, SKIP (Simple Key management for IP) and ISAKMP/Oakley is the most popular key management technology.
The public key encryption may apply in the information storage and exchange period provides the personal message protection. If the user wants the information security preservation in own hard disk, then he may cause it not foreign divulging through the key. If the user wants the intelligence transmission for another side, the key encryption technique to be possible to guarantee even if information by 3rd side capture, also cannot read, but the receiving end may through tell in advance or the joint consultation key success realizes the decipher process.
Because each time corresponds needs a key support, like this may strengthen large-scale system's key management difficulty, and causes the user very difficult safety transmission network key. The public key encryption technique is usually suitable for large-scale system's information security mechanism, but the personal key encryption technique is often suitable for the small system's information security mechanism.
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