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'''Public-key encryption''' is a kind of [[encryption]] in which both the message and the public key are public. There is a private key used known only to the individual. This differs from the traditional (so-called "private-key") encryption, in which the key is kept secret from the intended recipient. Public-key encryption is a form of ''[[symmetry|asymmetric]] encryption'', meaning that it is much easier to encrypt a message than to decrypt it, at least without knowing the encryption key; this is the reason that the key has to be made public.
'''Public-key encryption''' is an [[encryption]] method in which both the message and the public key are public. There is a private key used known only to the individual. This differs from the traditional (so-called "private-key") encryption, in which the key is kept secret from the intended recipient. Public-key encryption is a form of ''[[symmetry|asymmetric]] encryption'', meaning that it is much easier to encrypt a message than to decrypt it, at least without knowing the encryption key; this is the reason that the key has to be made public.
Well-known public-key encryption algorithms include '''Diffie-Hellman''',
Well-known public-key encryption algorithms include '''Diffie-Hellman''',
* Fred '''encrypts''' the message using his ''private key''. (only fred knows this key)
* Fred '''encrypts''' the message using his ''private key''. (only fred knows this key)
* Fred sends the message
* Fred sends the message
* George gets the message (so do many other people , its not important)
* George gets the message (so do many other people , it's not important)
* George '''decrypts''' the message using Freds ''Public key''.
* George '''decrypts''' the message using Freds ''Public key''.
* Only a message coded with the private key can be decoded wth the public key so George knows it came from Fred.
* Only a message coded with the private key can be decoded wth the public key so George knows it came from Fred.
* only Freds ''private key'' can '''decrypt''' the message , so it is secure
* only Freds ''private key'' can '''decrypt''' the message , so it is secure
* Fred receives the message and decrypts it
* Fred receives the message and decrypts it
* its a valid message but Fred cant know who sent it , anyone with the public key could send to him.
* it's a valid message but Fred cant know who sent it , anyone with the public key could send to him.
This form of public key encryption works best with sets of private and public keys.
This form of public key encryption works best with sets of private and public keys.
<references/>
<references/>
== See Also ==
# [http://www.networkworld.com/news/64452_05-17-1999.html | Public key encryption for Dummies]
# http://www2.krellinst.org/UCES/archive/modules/charlie/pke/
[[Category:Cryptography]]
[[Category:Cryptography]]