[Cfrg] I-D Action: draft-irtf-cfrg-pairing-friendly-curves-04.txt

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This draft is a work item of the Crypto Forum RG of the IRTF.

        Title           : Pairing-Friendly Curves
        Authors         : Yumi Sakemi
                          Tetsutaro Kobayashi
                          Tsunekazu Saito
	Filename        : draft-irtf-cfrg-pairing-friendly-curves-04.txt
	Pages           : 44
	Date            : 2020-04-28

Abstract:
   Pairing-based cryptography, a variant of elliptic curve cryptography,
   has received attention for its flexible and applicable functionality.
   Pairing is a special map defined over elliptic curves and it can be
   applied to construct several cryptographic protocols such as
   identity-based encryption, attribute-based encryption, and so on.  At
   CRYPTO 2016, Kim and Barbulescu proposed an efficient number field
   sieve algorithm named exTNFS for the discrete logarithm problem in a
   finite field.  Several types of pairing-friendly curves such as
   Barreto-Naehrig curves are affected by the attack.  In particular, a
   Barreto-Naehrig curve with a 254-bit characteristic was adopted by a
   lot of cryptographic libraries as a parameter of 128-bit security,
   however, it ensures no more than a 100-bit security level due to the
   effect of the attack.  In this memo, we summarize the adoption status
   of pairing-friendly curves in standards, libraries and applications,
   and classify them in 128-bit, 192-bit, and 256-bit security levels.
   Then, from the viewpoints of "security" and "widely use", we select
   the recommended pairing-friendly curves considering exTNFS.


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