PRESENT's pLayer permutation

PRESENT http://www.lightweightcrypto.org/present/present_ches2007.pdf is an "Ultra-Lightweight Bllock Cipher]] proposed for, and apparently gaining traction for, extremely constrained environments such as RFID tags and sensor networks

• the Internet of Really Small Things (IoRST).

PRESENT's pLayer has been called "unusual" by crypto experts familiar with other algorithms. It is

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