[Cryptography] Steganography and bringing encryption to a piece of paper

[Bill Stewart]

At 02:40 PM 7/19/2014, John Gilmore wrote, about places to hide bits:
>How about in the essentially unused "Type of Service" byte in every 
>IPv4 packet?

There's a significant chance of that one failing, unlike most of the other
possibilities John mentioned, at least for traffic that crosses
peering points between ISPs.  There are ISPs that support ToS,
but only for customers who are paying extra for it,
but unless things have changed since I was last working with backbone folks,
most of the major ISPs kill or reset non-routine traffic
except for those customers, as well as not doing any useful support 
for multicast.

(And unfortunately, the ToS system was designed with the default
priority level being "0", and bigger numbers for higher priorities,
while it would be more useful to have the default be "1",
and let you mark stuff "0" if it's loss/delay-tolerant,
so your FTP or BitTorrent traffic won't crowd out everything else.)