- Step 1.
- Put the elliptic curve into
Weierstrass form
, via the transformation

In our case, we obtain the curve - Step 2.
- Fix the precision and compute . In our case, and .
- Step 3.
- Compute the action of Frobenius on the two
differentials
and
as an element of
, with a precision of
digits.
Furthermore, group the terms of
as
, where the
are in
of degree less than 3.
In our case, we compute

- Step 4.
- Now we must reduce the
differentials. We want to write each of the
0 1 2 0 1 2 Thus we wish to write as a linear combination of , , and , all modulo 25 (we may ignore the lower powers of present in the differentials, as we will take care of them in the steps to come). We find that taking

Now we wish to write as a linear combination of , , and , modulo 25. We find that taking

Next, we reduce

Now we proceed as in the case of , and we wish to write as a linear combination of , , and , all modulo 25. We find that taking

Finally, we wish to write as a linear combination of , , and , all modulo 25. We find that taking

- Step 5.
- Now we form the matrix of the reduced differentials, where each reduced differential gives us a column in the matrix of absolute Frobenius. In our case, we have .