Substitution–permutation network

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In cryptography, an SP-network, or substitution–permutation network (SPN), is a series of linked mathematical operations used in block cipher algorithms such as AES (Rijndael), 3-Way, Kalyna, Kuznyechik, PRESENT, SAFER, SHARK, and Square.

Excerpt from the Wikipedia article “Substitution–permutation network”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Michel Bakni, CC BY-SA 4.0, via Wikimedia Commons.