Paper 2009/623 Original: eprint.iacr.org/2009/623 ↗
Universally Constructing 12-th Degree Extension Field for Ate Pairing
Abstract
We need to perform arithmetic in $\Fpt$ to use Ate pairing on a Barreto-Naehrig (BN) curve, where $p(z)$ is a prime given by $p(z)=36z^4+36z^3+24z^2+6z+1$ with an integer $z$. In many implementations of Ate pairing, $\Fpt$ has been regarded as the 6-th extension of $\Fpp$, and it has been constructed as $\Fpt=\Fpp[v]/(v^6-\xi)$ for an element $\xi\in \Fpp$ such that $v^6-\xi$ is irreducible in $\Fpp[v]$. Such $\xi$ depends on the value of $p(z)$, and we may use mathematic software to find $\xi$. This paper shows that when $z \equiv 7,11 \pmod{12}$ we can universally construct $\Fpp$ as $\Fpt=\Fpp[v]/(v^6-u-1)$, where $\Fpp=\Fp[u]/(u^2+1)$.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2010-02-19: last updated
- 2009-12-26: published
- Short URL
- https://ia.cr/2009/623
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2009/623,
author = {Masaaki Shirase},
title = {Universally Constructing 12-th Degree Extension Field for Ate Pairing},
howpublished = {Cryptology {ePrint} Archive, Paper 2009/623},
year = {2009},
url = {https://eprint.iacr.org/2009/623}
}