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Block Ciphers
Block cipher algorithms encrypt data in block units, rather than a single bit
at a time. The most common block size is 64 bits.
Because each block is heavily "processed," block ciphers are generally
considered more secure than stream ciphers. However, block cipher algorithms tend to
execute quite a bit slower.
All that the basic block encryption algorithm specifies is how to get a block
of ciphertext from a block of plaintext and vice versa. All the other
implementation details (for example, padding, initialization vectors, and cipher modes)
are specified independently of the algorithm. These options are discussed in
the next few sections.
The only block cipher provided with the Microsoft RSA Base Provider is the RC2
block cipher. This algorithm has a block size of 64 bits.
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