17 Dec
2003
17 Dec
'03
11:17 p.m.
On reflection, it seems that some users will want an interoperable standard, and other users will want complete stealth. So what I'll do is add a bunch of switches to pnmstego and pnmdestego, so that the user can specify all sorts of different formats. Letting the switches default will get you a simple interoperable mode, so you can send stuff to people without prior arrangement or put stuff on an ftp server; but an attacker will be able to extract the bits and try to decrypt them. Specifying things like offsets and bit-usage schedules will mean that the attacker won't even be able to extract the bits; but the settings you use will be equivalent to that much more key material that you have to communicate or remember. --- Jef