SIMON and SPECK: Block Ciphers for the Internet of Things.
Ray Beaulieu, Douglas Shors, Jason Smith, Stefan Treatman-Clark, Bryan Weeks, Louis Wingers · 2015
The U.S. National Security Agency (NSA) developed the Simon and Speck families of lightweight block ciphers as an aid for securing applications in very constrained environments where AES may not be suitable. This paper sum-marizes the algorithms, their design rationale, along with current cryptanalysis and implemen-tation results. 1