[curves] Misc news (BLS12-381, VRFs, small subgroup attacks, workshop)

[Trevor Perrin]

Various EC developments:

 * BLS12-381, a pairing-based curve for 128-bits security, proposed for Zcash:
https://z.cash/blog/new-snark-curve.html

 * Another writeup of a VRF using Chaum-Pedersen and elliptic curves
(similar to CONIKS, VXEdDSA, etc):
https://eprint.iacr.org/2017/099.pdf
https://datatracker.ietf.org/doc/draft-goldbe-vrf/

 * Nice writeup of small subgroup attacks against JOSE, apparently 5
libraries were vulnerable to this (?!)
http://blogs.adobe.com/security/2017/03/critical-vulnerability-uncovered-in-json-encryption.html

 * 21st Workshop on Elliptic Curve Cryptography:
https://ecc2017.cs.ru.nl/index.shtml


Trevor