Skeincoin SKC is a Proof of Work cryptocurrency which uses a 2 factor encryption. First using the Skein algorithm and then using a second encryption using SHA256. The Skein is an crypto hash algorithm developed by Niels Ferguson, Stefan Lucks, Bruce Schneier, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas and Jesse Walker. 

The currency is mineable using CPU, GPU, FPGA and ASIC.