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Laël Cellier on Fri, 18 Jul 2025 16:12:16 +0200
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Re: What's the code for doing the reverse of this code over the altbn128 curve
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- To: pari-users <pari-users@pari.math.u-bordeaux.fr>
- Subject: Re: What's the code for doing the reverse of this code over the altbn128 curve
- From: Laël Cellier <lael.cellier@gmail.com>
- Date: Fri, 18 Jul 2025 16:12:12 +0200
- Delivery-date: Fri, 18 Jul 2025 16:12:17 +0200
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Thank you, and this would work with any point having the correct
order ? or would this work only with points having coordinate
withing specific bounds ?
Dear Laël,
What you are looking for is ffinvmap:
? mapi = ffinvmap(map);
? twisti(pt) = [ffmap(mapi,pt[1]/w^2), ffmap(mapi,pt[2]/w^3)];
? pt3 = twisti(pt2);
? pt3 == pt
%15 = 1
Cheers,
Aurel