Added ECC and DH key exchange. (#137)

README.md

@@ -77,6 +77,8 @@ A curated list of cryptography resources and links.
 #### Asymmetric encryption
 
 - [RSA](https://en.wikipedia.org/wiki/RSA_(cryptosystem)) - One of the first practical public-key cryptosystems and is widely used for secure data transmission. In RSA, this asymmetry is based on the practical difficulty of factoring the product of two large prime numbers, the factoring problem.
+- [ECC](https://en.wikipedia.org/wiki/Elliptic-curve_cryptography) - Public-key cryptosystems based on the algebraic structure of elliptic curves over finite fields.
+- [DH](https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange) - A method of exchanging cryptographic keys securely over a public channel. Unlike RSA, the Diffie-Hellman Key Exchange is not encryption, and is only a way for two parties to agree on a shared secret value. Since the keys generated are completely pseudo-random, DH key exchanges can provide forward secrecy (https://en.wikipedia.org/wiki/Forward_secrecy).
 
 #### Transform Encryption