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 So? Public-key cryptography giveS an anSwer to thiS problem. (2003-04-12)
