SP Networks

• To increase block size we need (prohibitively) larger tables
• As an example a function 16 -> 16 bits would require a table of 2²⁰ bits (16 * 2¹⁶).
• A substitution permutation network requires a lot less storage
• Data has to pass through the network multiple times to add diffusion and confusion to the plaintext
• Result is called a product cipher
  • DES
  • AES

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 Last change: Saturday, June 7, 2003 10:28 am
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