skinny
Tweakey Schedule
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The tweakey arrays are updated as follows (the tweakey schedule is illustrated and end of this page). First, a permutation PT is applied on the cells positions of all tweakey arrays
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Every cell of the first and second rows of TK2 and TK3 (for the SKINNY versions where TK2 and TK3 are used) are individually updated with an LFSR
You can look at Permutation and LFSR in detail in below links
Complete flow diagram for tweakey schedule
