- [scrypt](https://github.com/wg/scrypt) - Pure Java implementation of the scrypt key derivation function and a JNI interface to the C implementations, including the SSE2 optimized version.
- [GDH](https://github.com/maxamel/GDH) - Generalized Diffie-Hellman key exchange Java library for multiple parties built on top of the Vert.x framework.