In cryptography, a private or secret key is an encryption/decryption key known
only to the party or parties that exchange secret messages. In traditional secret key cryptography,
a key would be shared by the communicators so that each could encrypt and
decrypt messages. The risk in this system is that if either party loses the key or it is stolen,
the system is broken. A more recent alternative is to use a combination of public and private keys.
In this system, a public key
is used together with a private key. See public key infrastructure (PKI) for
more information.
This was last updated in June 2007
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