bias.c takes a binary file on standard input (such as output of a stream
cipher) and checks for bit biases. It supports a "-v" (for verbose) flag
to report everything; normally it only mentions interesting facts. A single
numeric argument makes it analyse blocks of that many bytes in parallel,
so you might analyse a word-oriented stream cipher with "t32 | bias 4",
say. Otherwise it just does a single big count. It's intended to work on
very large data sets; I processed 170GB in an hour on a serious PC. 

bias.c is sourced from:

	http://www.qualcomm.com.au/UsefulStuff.html