Skein is a hash function designed by Niels Ferguson - Stefan Lucks - Bruce Schneier - Doug Whiting - Mihir Bellare - Tadayoshi Kohno - Jon Callas - Jesse Walker
Submitted to NIST for their cryptographic hash algorithm competition.
The Skein website: The Skein Hash Function Family
This is a placeholder for future discussions on Skein and its implementation in Tcl.