Jeroen Demeyer on Sun, 09 Dec 2007 16:31:16 +0100

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FFELT: how to recover the field?

Hello list,

Given a FFELT x in characteristic p, I would like to compute a p-th root of x. The most obvious way to do this is to compute x^(p^(n-1)), where p^n is the cardinality of the field. However, how can I recover p and n given only the FFELT? Obviously, it suffices to get the polynomial defining the finite field (i.e. the argument given to ffgen()). I tried x.mod, but that doesn't work.