<cryptography> As opposed to public-key cryptography, a cryptographic
method in which the same key is used to encrypt and decrypt the message.
Private-key algorithms include the obsolescent Data Encryption Standard (DES),
triple-DES (3DES), the Advanced Encryption Standard (AES), also known as
Rijndael, Blowfish, Twofish RC2, RC4, RC5 and RC6.
A problem with private-key cryptography is that the emitter and the recipient of
the message must agree secretly on a common key beforehands; but how can they do
Public-key cryptography gives an answer to this problem.
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