Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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[[Symmetric Algorithms]] use the same key to encrypt and decrypt the message (''see [[CryptographY/Keys]] for details. 
They can be divided into stream CipheR's and block CipheR's. The former encrypts the bits of the plaintext one at a time, while the former takes a number of bits and encrypts them as a a single unit. Normally blocks of 64 bits are used.