http://blog.commandlinekungfu.com/2009/09/episode-58-thats-pretty-random.html
and
http://lists.freebsd.org/pipermail/freebsd-bugs/2010-January/038142.html
give us:
head -n 64 /dev/urandom | env LC_CTYPE=C tr -dc 0-9 | cut -c1-64
OAUTH nonce ftw.
echo `date +%s`
Timestamp ftw.
python -c “import hashlib,hmac;print hmac.new(‘keu’, ‘data’ , hashlib.sha1).hexdigest() ” Signature ftw.