Long description
The block diagram of a stream cipher encryption shows an arrow pointed to x subscript n plus 2, x subscript n plus 2 is connected to x subscript n plus 1 with an arrow, and then x subscript n plus 1 is connected to x subscript n with an arrow which further connects to an adder. Then, an arrow points towards p subscript n plus 2 which is connected to p subscript n plus 1 with an arrow, and then p subscript n plus 1 is points to p subscript n with an arrow which further connects to an adder. The output of the adder is fed to c subscript n, from which an output is obtained.
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