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I have found these notions recently in an article. What is fixed randomness ? What is unfixed randomness ? Link of the article : http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.431.9034&rep=rep1&type=pdf Page 8, part 4.1, Encrypt() algorithm. Thank you!

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    $\begingroup$ The definition of $Encryption$ defines $(t,r_1)$ as inputs. It isn't immediately clear what the authors mean by fixed randomness, but looking ahead to the definition of game $G_8$, we see that fixed randomness is chosen by the challenger. Perhaps, and I'm guessing, $(t,r_1)$ are constants that are initialized as random values (in the game and by the administrator in applications). Maybe ask the authors for clarification. $\endgroup$ – Alpha Bravo Aug 8 '18 at 13:27

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