17 Dec
2003
17 Dec
'03
11:17 p.m.
About sending bad blocks... if your receiving party can listen in on the transmission, you could simply change the program for them to include another checksum somewhere else in the middle of the block. Say, packet a has a bad checksum, then its a candidate for hidden info.. so you check your secret checksum. If it matches, you decode the compressed block. Obviously, your transmitter should send the steggoed data twice due to possible real errors which would eat your cyphermessage for lunch. Of course the repeats would have to look different than the originally sent stegoed packets or else the warden might get suspicious if he decides to have a look at the bad packets...