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The Feistel-2 cipher is a type of Feistel ciphers proposed by Isobe and Shibutani at Asiacrypt 2013. Its round functions consist of a public F-function and a subkey XORed before the F-function. Recently, a variation of the Feistel-2 cipher, in which the subkey is XORed after the F-function, has been widely used in proposals such as SIMON and Simeck. The authors denote this type of Feistel ciphers...
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