Elliptic Curve
From CryptoWiki
"Those of you who know what public-key cryptography is may have already heard of ECC, ECDH or ECDSA. The first is an acronym for Elliptic Curve Cryptography, the others are names for algorithms based on it.
Today, we can find elliptic curves cryptosystems in TLS, PGP and SSH, which are just three of the main technologies on which the modern web and IT world are based. Not to mention Bitcoin and other cryptocurrencies."
https://andrea.corbellini.name/2015/05/17/elliptic-curve-cryptography-a-gentle-introduction/