Editing Yarrow algorithm (section)

====Generation====
[[File:Functions for Generation Mechanism.png|thumb|Functions for generation mechanism]]
Yarrow-160 uses three-key [[Triple DES]] in counter mode to generate outputs. ''{{math|C}}'' is an ''n''-bit counter value; ''{{math|K}}'' is the key. In order to generate the next output block, Yarrow follows the functions shown here.

Yarrow keeps count of the output block, because once the key is compromised, the leak of the old output before the compromised one can be stopped immediately. Once some system security parameter ''{{math|P<sub>g</sub>}}'' is reached, the algorithm will generate ''{{math|k}}'' bits of PRNG output and use them as the new key. In Yarrow-160, the system security parameter is set to be ''10'', which means ''{{math|P<sub>g</sub> {{=}} 10}}''. The parameter is intentionally set to be low to minimize the number of outputs that can be backtracked.