Table 2.

SIMON cipher notations.

Notation	Description
⊕	Bitwise XOR
&	Bitwise AND
Sj	Left circular shift, Sj, by j bits
S−j	Right circular shift, S−j, by j bits
n	Word size
2n	Block size
m	Key words
mn	Key size
i	Round counter, where 0 ≤ i ≤ T − 1
zj	Constant sequence, where j = 0, 1, 2, 3, 4
T	Number of cipher rounds
F	Round function
k	Round key (sub-key)
c	Constant