[ILUG] Re: please tell me

[Ken Guest]

# -----Original Message-----
# From: Dave Neary [mailto:dave.neary at palamon.ie]
# Sent: 20 September 2001 10:25
# To: Silvan delaney
# Cc: ilug at linux.ie
# Subject: Re: [ILUG] Re: please tell me
# 
# 
# Silvan delaney wrote:
# > 
# > hi ,
# > i hope one of you can give me a clear answer to question:
# >  i want to do the following:
# > create an image as elaborate as you wish, any kind realy, 
# and then insert in 
# > miniature, read hidden, a little text message.
# > you know the one that one can't see if one just looks at 
# picture/ image.
# > now i need this to work within the one programm or, 
# alternatively, two 
# > programms that understand either one.
# 
# You need to 
# a) come up with an image format, and include the capability to store
# extra-image data as messages (as comments, or by ignoring bits in a
# regular fashion & putting them together later) or
# b) Use an existing image format which already includes this 
# capability.
# There are many, for example pnm (uncompressed rgb 8-bit values with a
# header), png, gif (header), jpeg (header) - for most of these 
# a perusal
# of the source code for the gimp in plugins/common may help.

Which leads to embedding encrypted messages in the headers of those 
pnm/png/gif/jpeg files for a higher security thru obscurity quotient.

k.