bilibin's red knight
noanon
Fravia's Anonymity Academy

Fravia's STEGANOGRAPHY
(STARTING PAGE)
Updated September 1998
(Only basic readings and a sieve: my tricks are elsewhere)

How to hide information effectively
~
Cracking steganographical algorithms

  Easy entrance to Advanced stenography provided by Tsehp


Courtesy of Fravia's page of reverse engineering
Files related with this section
(related essays from my software reverse engineering section)

Well I remember a beautiful essay by Frog's print about something related with steganography: Watermarking of digital images, here it is: redPhotoShop 4.0 / Digimarc Commercial stupidity - Digimarc downfall where you'll be able to see how easy it is to reverse some 'very heavy' (and expensive) watermarking commercial applications, like Digimarc. If you are interested in Watermarking problems, you'll find on the web watermarking tools and tools to 'unwatermark' images (like Unzign and Stirmark).

How to reach Fravia's 'advanced steganography' pages, the hard way
Jean Flynn's "A Journey within Steganos" ('light' version)
10 february 1998 __NEW__

How to reverse engineer Steganos (First step)
Mrf's "Speed up brute force cracking"
13 february 1998 __NEW__
I'll add here more essays as soon as you start writing them. Some short essays about advanced steganographical cracking (cracking of the steganographocal algorithms themselves of course, not of the software programs to perform steganography, which, as you will see, are all either not at all or ridicously protected :-) are or will be asap in the 'advanced steganography' page of mine (see below).
Of course we are a little 'cheating' here. In order to crack at ease you'll get the ORIGINAL image used as carrier (something you won't get in real life) and I have used very easy password options, as you'll see.
Reasons for this section
Well, I have received so many questions about steganography, after having written inside my revamped anonymity academy page the following...

Morale: keep your sensitive data ON THE WEB somewhere where nobody 

in his right mind would ever look, nor understand them even if he did 

(say steganographed inside the dull images of a bogus page like "me 

and my little dog Barkie" :-) they will be MUCH more safe there than 

inside your own harddisk!
...that I realized that many among my readers don't even know the most elementary basic of hiding (and/or retrieving hidden) data on the web and elsewhere...
Yet hiding (and retrieving hidden :-) data is a VITAL question, on the web and in life, when so many people are continuously (and increasingly) trying to get their hands on your money/convinctions/future through your data, using all known tricks of the books (and some less known ones as well, as +ORC explains in his slaves of the supermarkets famous essay... btw there are some passages about steganography itself in his "6" lessons, if I'm not mistaken)
So, dear reader, just do what you're supposed to do anyway: READ! In fact I believe you better read and head the following, and then start your own studies on this matter as soon as you'll be able to.
Unfortunately, for once, this time I will and cannot explain too much publicly (because I'm actually using myself quite a lot of the tricks I have to describe) yet I want to explain everything nevertheless: the whole idea of my site is that knowledge should be passed on to anybody who cares... but i need a 'sieve' in order to see if you really care... I have taken the idea from +ORC's famous gates, and it works!.
Hope you'll understand me: lamers and leechers must be kept somehow away, at least for a little while, else they will immediately start using the same tricks 'en masse' for some stupid purpose and spoil the game for me and all other real +crackers around.

So this page is and will remain only a 'start' platform. Don't be deceived! You'll get on this very page enough information to make you happy, and you will be able to deepen it and work on it at leisure (and this page will be updated, and you'll always find a lot here)... yet you WILL NOT get to the advanced steganography page, unless you crack the BMP and GIF images that you'll find on this page.

This should sieve lamers and leechers out, I hope.

Purpose of the sieve
The sieve has another purpose: to teach you how to reverse the algorithms used by the main steganographical applications (admittely using the softer forms of encryption allowed, in order to 'offer you the throat' for your attacks :-)
You see: this is a reverse engineering site (may be THE reverse engineering site :-) and you'll therefore now begin to use some of the techniques that you have learned reversing and cracking software in order to proceed further.

Yes. You won't be able to go further without having studied (at least a little), +ORC's tutorial and his students' essays, in other words: you need to know (at least a little) how to reverse engineer software in order to understand many other aspects of the web, inter alia steganography (but I think you'll be thankful that you did learn our techniques: I reckon that this is more and more useful regarding life in general as well... without reverse engineering knowledge you are only a Guinea pig for the commercial slaughtering powers of our disgusting society). So let's start cracking, and working, and getting onwards...
Let's not forget what +ORC wrote:
"...I need your knowledge as much as you need mine, so build some and start contributing..."
right so! And this applies here as well, you'll therefore have to perform some 'applied steganographical cracking':

An easy first step (I will use as 'bait' some secret locations on the web) where you'll have to crack either the algos used by CONTRABAND (version 9g) for BMPs images or those used by Hide and seek (version 4.1) for GIF's images.

A less easy second step (I will use as 'bait' the location of the 'advanced steganography page'). Here you'll have to crack the algos used for BMP files by Steganos for windows 95 (version 1.0a).

Ah yes, a last thing: as images I'll use only Tamara de Lempicka's pictures... you may not be excused for not knowing her paintings and this will remind you that there are other things to reverse in life (like culture, duh :-)
Fravia's STEGANOGRAPHY STARTING PAGE


The word steganography is derived from greek and means "coverted writing", from stegein, to cover... the same root as in Stegosaur, a quadrupedal, herbivorous ornithiscian dinosauar of Jurassic films and early Cretaceous times, well known for being quite 'covered' through an armor of triangular bony plates on his back spine.

Steganography is the art (and science) of communicating hiding THE EXISTENCE of communication, in contrast with cryptography. Ideally, your enemies, or the one you are fighting against, or even your friends, should not even imagine that there IS a message concealed somewhere.
This very characteristic makes steganography the IDEAL science for hiding messages on the web, which is flooded by non-significant data. Your whole passwords and everything you need can without any problem be hidden inside three or four 'fake' pages you'll have uploaded somewhere, with images like 'my sister Sally and his favourite banana fishes' or whatever.
You will download all fake images from the web (geocities page are a never ending source of incredibly dull lifes and fotographies :-), you will MODIFY them (the greatest risk for steganography is the confrontration between 'original' image without concealed message and steganated image with message, of course), and only after these modifications you will hide your concealed message inside them with one of the many programs that you'll find around.

Basically, using steganography, you can smuggle any file(s) over any communication-line (BBS, network, modem, diskmail, etc.) in a format which leaves the smuggled data untraceable and unreadable.

Here you have a link to my own copy of a BMP graphic format stegonograpical utility: redCONTRABAND (version 9g, by Hens Zimmerman and Julius Thyssen... their web location is: http://www.GalaxyCorp.com/009 or, alternatively, http://come.to/us. It's freeware, so there is nothing to crack. In my own copy you'll find also THE COMPLETE SOURCE CODE (in Borland C++ 4,5) of Contraband, which may be of interest for you.

Here you have a link to my own copy of a GIF graphic format stegonograpical utility: redHide and Seek (version 4.1), by colin maroney. It's freeware, so there is nothing to crack. In my own copy you'll find also THE COMPLETE SOURCE CODE (in Borland C++ 3.1) of Hide and Seek, which may be of interest for you. In general I love working with programs (and onto programs) I have the source code of. In fact, I like it so much that if I really use a program and do not have the source code I re-create it myself reversing the whole bazaar, or at least the parts I need or fancy to change...
I'm sure therefore that you'll appreciate the presence of the source code for BOTH programs, this will allow you to delve pretty deep inside all mysteries and vagaries of our applied and advanced stegonography.
You may find A LOT more UNIX source code here

Now try cracking these images! (a first easy step)

I will give you a "bait" in order to pull your reversing capacities, Let's start with a bmp image... you'll have to perform here an (easy) crack of CONTRABAND (version 9g)

Here you have two zipped bmp(s) images with a famous picture from Tamara de Lempicka: Andromeda. You may download the redoriginal andromeda and the redstegonated andromeda.

Both images have been zipped (from bmp format)
Unzip them and have a look.
You wont spot any differences, yet inside the second one I have hidden -using contraband- a small text file: secfiles.txt which was only 587 bytes long.
Inside secfiles.txt, if you ever reverse it 'out' of the BMP image, you'll be able to find a LIST OF SOME SECRET LOCATIONS of files on the Web, files that you may find interesting and locations which are not given anywhere else inside my sites.
I'm sure that you will probably enjoy some of those files... well, you won't get them unless you crack the stegonated bmp picture above :-)
Now try cracking these images! (a second easy run)

I'll offer another run -this time in gif format- to the reversing capable among my readers: Here you have two copies of the famous Andromeda by Tamara de Lempicka:

~
the original Andromeda and the 'stegonated' Andromeda
. This time you have the two GIF images above, and the same file as above (587 bytes long) has been hidden inside the 'stegonated' GIF using hide and seek version 4.1.
I used a very short and easy to crack (4 numbers) encryption key (the same used for the 'contraband' bmp(s) above, by the way), so it's a very easy brute force attack, yet you can crack this in a more 'zen' way, as you'll see, later, when you arrive to my advanced steganography page.
Inside secfiles.txt, if you ever reverse it 'out' of the GIF image, you'll find a LIST OF SOME SECRET LOCATIONS of files on the Web, locations which are not given anywhere else inside my sites.


Well... crack this one instead of the previous one, if you prefer :-)

Come on... you should manage it... and anyway I believe you'll find it a worthy approach to steganographycal cracking!
Inside the steganographed images above you'll NOT find as an added bonus the location of my 'advanced steganography academy' pages, which are NOT linked from my 'common' sites, nor dwell on this server. You'll find some 'secret' files, tough, as I said, and you'll find it relatively EASY to crack. In order to reach my advanced steganography pages you'll have to crack the two BMP pictures at the BOTTOM of this page.
See you there!

A little steganographical history
You'll find it on the History of Steganography ad hoc page.

Additional Information
WARNING: The following has been pilfered from a VERY GOOD PAGE:
http://members.iquest.net/~mrmil/stego.html
I'll slowly modify and add links here as time goes by, for the following information you should not thank me, but Eric's Milbrandt Home Page
(hope Eric wont mind)

Steganography Downloads

Windows

Hide and Seek for Win95 (96k) __NEW__
Hide and Seek for Windows 95 is a BMP-based steganography program by Colin Moroney, the author of the dos versions of Hide and Seek. This version is a considerable step up from his previous efforts. Its professional-looking interface makes it easy to use. The file wiping options and blowfish header encryption method are added bonuses. Unfortunately, downloads are ITAR restricted, however, a 40-bit key version is available for international downloads.
Steganos for Win95 (1085k) __NEW__
Steganos for Windows 95, by Deus Ex Machina Communications, is an easy to use, yet powerful wizard style program to encrypt files and hide them within BMP, DIB, VOC, WAV, ASCII, and HTML files. A significant improvement over the DOS version, Steganos for Win95 even contains its own Shredder, a program which permanently wipes files from your hard disk. There is also a German version. With all of the new features and added functionality, Steganos for Win95 is a serious contender.
S-Tools4 (272k) (alternative site) (alternative site)
S-Tools v4 is an excellent Win 95/NT based steganography tool that hides files in BMP, GIF, and WAV files. It will not run with Win 3.1. S-Tools v4 has a number of new improvements over the previous version.
S-Tools3 (283k) (alternative site)
An excellent Windows based steganography tool. Hides files in BMP, GIF, WAV, and unused space on floppies!
Contraband (281k) __NEW__
Windows-based program which embeds and extracts any thinkable file into 24-bit BMP's. Includes source code.
PGPn123 (428k)
PGPn123 is primarily a pgp "windows clipboard" shell program that makes using pgp for Eudora, Agent, or Pegasus Mail very easy. The latest version includes a steganography option that is implemented after the message is pgp encrypted. The algorithm is based on the Texto program, making encrypted text files look like something between mad libs and bad poetry.
Scytale (575k) __NEW__
Scytale is a pgp shell program that has the added feature of hiding data in PCX images. Other strengths of the program include a built-in wiper and batch mode capabilities.

DOS
JSteg (462k) __NEW__
JSteg, by Derek Upham, is currently the only DOS program available for hiding data within the popular JPG format. Prior to hiding data in a JPG file, you will need to save that file in the TGA (targa) format. After the data is stego'd into the image, the resulting output file will be in the JPG format, with all of the compression advantages that JPG entails. Previously only available for Unix, Preston Wilson and Randall Williams have been kind enough to compile this DOS version for your stego pleasure. It requires this support file (40k) placed in your path.
Texto (59k) __NEW__
Texto is a text steganography program which transforms uuencoded or PGP ascii-armoured data into English sentences. Texto text files look like something between mad libs and bad poetry. This is the only DOS implementation of the Unix source code and is compiled courtesy of Preston Wilson. It requires this support file (40k) placed in your path. Be sure to visit the online demo page!
GZSteg (346k) __NEW__
GZSteg hides data in GZip compressed files. It was compiled for DOS by Preston Wilson and requires this support file (40k) placed in your path.
Hide4PGP v1.1 (70k)
Hide4PGP v1.1 by Heinz Repp is a steganographic program that hides data within BMP, WAV, and VOC files. It is designed to be used with both PGP and Stealth, but also works well as a stand-alone program. Hide4PGP now comes in both DOS and OS/2 executables. The source is also included and should compile on any platform without major problems. Also new to this version, you now can use any number of least significant bits (up to eight) to hide your data.
Steganos v1.4 (12k)
Steganos is a small, easy to use DOS based stego program by Fabian Hansmann that hides data inside BMP, VOC, WAV and even ASCII files!
Pretty Good Envelope (25k)
Pretty Good Envelope (PGE) is a DOS based program that hides a message in another file by the very simple method of appending the message to the file, and then appending a 4 byte little endian number which points to the start of the message. A companion program UNPGE retrieves the message. PGE can be used with graphic files (GIF and JPG) or any other binary files, including .COM and .EXE files.
Stealth (19k) (alternative site)
Stealth is a simple filter for PGP which strips off all identifying header information to leave only the encrypted data in a format suitable for steganographic use. That is, the data can be hidden in images, audio files, text files, CAD files, and/or any other file type that may contain random data, then sent to another person who can retrieve the data from the file, attach headers, and PGP decrypt it.
Hide and Seek v4.1b (264k) (alternative site)
Data hiding/seeking using GIF image files. These DOS programs take data, usually text, including encrypted text, and hide it in a GIF file.
Hide and Seek v5.0 (199k) (alternative site)
The latest version of Hide and Seek has been totally redesigned. It is still a DOS based program, but now includes a user interface (no more command line operations) to hide info in GIF files.
Snow (27k) (alternative site)
Snow is a text-based stego program by Matthew Kwan that conceals messages in text files by appending tabs and spaces on the end of lines. Tabs and spaces are invisible to most text viewers, hence the steganographic nature of this encoding scheme. Snow includes a compression function to allow you to stego more information into a given file and has some basic crypto functions via the ICE algorithm. Check out the homepage for DOS, Java, Java applet, and source code versions.
FFEncode (12k)
FFEncode is an interesting little DOS program that "hides" a file in a text file by using a "morse code" of NULL chararcters. Unpack the zip file and type FFENCODE or FFDECODE at the DOS prompt for the simple command line parameters.
StegoDos (22k) (alternative site)
This DOS based picture encoder consists of a group of programs designed to let you capture a picture, encode a message in it, and display it so that it may be captured again into another format with a third-party program, then recapture it and decode the message previously placed inside it.
Wnstorm (84k) (alternative site)
Wnstorm (White Noise Storm) is a cryptography and steganography software package which you can use to encrypt and hide files within PCX images.

Java

EZStego Java
EZStego Java is from Romana Machado, the author of Stego for Mac. It reportedly has similar steganographic functions as it's Mac-based predecessor, but is written in the platform independent Java language instead. It is currently it is being tested in an online version, allowing you to stego images from your web browser! The author plans to release the java code once the online testing is complete.
Snow (34k) __NEW__
Snow is a text-based stego program by Matther Kwan that conceals messages in text files by appending tabs and spaces on the end of lines. Tabs and spaces are invisible to most text viewers, hence the steganographic nature of this encoding scheme. Snow includes a compression function to allow you to stego more information into a given file and has some basic crypto functions via the ICE algorithm. Be sure to download the Java sources and classes. Also available as a Java applet.

Macintosh

Stego (266k)
Stego is a steganography tool that enables you to embed data in Macintosh PICT format files, without changing the appearance or size of the PICT file. Thus, Stego can be used as an "envelope" to hide a previously encrypted data file in a PICT file, making it much less likely to be detected (available as a binhexed StuffIt archive).
FatMacPGP 2.6.3
FatMacPGP 2.6.3 is the most recent version of MacPGP optimized for PowerMacs. It has a Stealth option which strips off all identifying header information to leave only the encrypted data in a format suitable for steganographic use.
Paranoid (80k) (alternative site) (65k)
Paranoid is primarily an encryption program that allows you to encrypt files with IDEA, triple DES, and an algorithm written by the author Nathan Mariels. It is a steganography program in that it allows you to hide files in sounds.

Amiga

Textego (41k)
Textego is based on the Texto program by Kevin Maher (with a few added improvements). It is a substitution cipher that makes text files look like something between mad libs and bad poetry. The source code is available, as is a homepage covering some of the highlights of the program. Be sure to visit the online demo page!

OS/2

Hide4PGP v1.1 (70k) __NEW__
Hide4PGP v1.1 by Heinz Repp is a steganographic program that hides data within BMP, WAV, and VOC files. It is designed to be used with both PGP and Stealth, but also works well as a stand-alone program. Hide4PGP now comes in both DOS and OS/2 executables. The source is also included and should compile on any platform without major problems. Also new to this version, you now can use any number of least significant bits (up to eight) to hide your data.
Texto (36k)
Texto is a text steganography program which transforms uuencoded or PGP ascii-armoured data into English sentences. Texto text files look like something between mad libs and bad poetry, (although they do sometimes contain deep cosmic truths) and should be close enough to normal english to get past simple-minded mail scanners. Be sure to visit the online demo page!
Stealth (94k)
Stealth is a simple filter for PGP which strips off all identifying header information to leave only the encrypted data in a format suitable for steganographic use. That is, the data can be hidden in images, audio files, text files, CAD files, and/or any other file type that may contain random data, then sent to another person who can retrieve the data from the file, attach headers, and PGP decrypt it.
Wnstorm (108k)
Wnstorm (White Noise Storm) is a cryptography and steganography software package which you can use to encrypt and hide files within PCX images.

Source Code

(for the Unix users out there)
The secret 'advanced steganography page
This is one of the letters I have received two days after having opened this section:
Fravia+,

   I am the author of Steganos for DOS and Windows 95

   (http://www.steganography.com)

   I think your pages are very useful so I just cracked the picture on

your stego.htm page - all I got are some zipped files, no URLs. 

Will there ever be something like 'advanced steganography academy' pages?



Thanks, Fabian fabian(at)demcom(point)com
And Fabian was not the only one (nor the first one :-) to have reacted immediately along these lines... OK, so I lied when I published the first version of this page, back in 1997... in fact I put only the 'secret files' inside the stegonated Andromeda picture, therefore you'll find no secret URL for an 'advanced steganography page' there (but I believe you will enjoy some of those files nevertheless)... mea culpa: I was not quick enough, and pleasingly surprised by your fast answers!!
The (not at all sad :-) fact is that (many among) my readers are TOO QUICK! You already cracked everything before I had a chance to prepare 'as it should' my 'advanced steganography page... yet that page begins to be ready now. So you'll now be able to start roaming using that "coveted" URL.
But, since it was such an easy cracking, with my 'Andromedas' above, I'll push up the ante! You will have to work a little more (do not complain! You are all here for the sake of cracking, aren't you?)
Here follows ANOTHER couple of a Tamara de Lempicka's picture, original and stegonated, in BMP format (zipped of course). I have enclosed the URL of my advanced page inside the stegonated one.
This time I have used Fabian's program itself: Steganos for Windows 95, that you'll be able to download at his URL (given in the letter above), or else redhere (1085k).
Now crack it and find the 'advanced URL', where you'll find some of the solutions essays I have received (+ReZiDeNt's lazy brute force approach, zeezee's "source code reversing", Massimiliano's "anticontraband" own utility and a small essay by Fabian himself, the author of Steganos, plus a very interesting complete essay by Flynn; more recently Gary Benson's "Unconventional access", with a clever exalination of Hide and Seek weak points)

t_tamra7.gif
You'll find BELOW two images (corresponding to the GIF above: portrait of Suzy Solidor, painted by Tamara in 1933) in zipped BMP format, the one that I have 'stegonated' (through Fabian's Steganos ver. 1.0a) carries 'inside' the URL of my "advanced steganography" page (which is under construction, yet already exist :-)

You may download here the redoriginal picture by Tamara de Lempicka (9282 bytes),
and here the redstegonated one with the hidden URL inside (8914 bytes).

New add_on: 2 January 1998
Advanced steganography URL (and password) have changed! (Password above was too easy)
December_help
Some help information: I have used very small images, a password still with 8 simple (yet no more extremely simple) alfabetic chars and no numbers nor punctuation signs, the hidden text is only an ASCII url, 36 bytes long (which has the following form: http://*.htm).
Moreover I have used BMP images with very few colours... something you should NEVER do if you stegonate for true.
Hint: try using yourself the various options of Fabian's Steganos on the original image...
Well, you have your chance, now crack! :-)

New_year's_add_on_help
Should the server given in the hidden URL not answer, (could happen, particularly during holydays) there is another server of mine with the SAME name_you_have_to_find.htm advanced steganography page, a 'second copy' that is, so you may as well access it there... once you find the name and have learned how to finger and NSLookup servers, an important and easy technique which you should master anyway)
Now try cracking these images! (a second easy run)
's-tools version 4.00, by Andy Brown)

I'll offer another run -this time in gif format- to the reversing capable among my readers: Here you have two copies of another famous picture by Tamara de Lempicka:

the original asleep girl and the 'stegonated' one

This time you have the two GIF images above, and the same text file as above (36 bytes long) has been hidden inside the 'stegonated' GIF using s-tools 4, by Andy Brown may be the best of the tools around. You can download it right HERE on my site.

I used the same key used for the 'steganos' bmp(s) above, by the way), so it's up to you how to devise an attack, you can crack this in a more 'zen' way, as you'll see.
Inside adva.txt, if you ever reverse it 'out' of the GIF image, you'll find the URL of the advanced steganography page
OK, OK, so you find this too difficult, yet I want you to be able to crack s-tools algos as well and not only steganos... so... here once more two SMALL images, in gif format: the same 36 bytes long adva.txt file is hidden inside, the same 8 characters password has been used, the option chosen have been, once more, IDEA and attempt to lower number of colours... well, I think you should have enough data now... crack!

~
the original asleep girl's hand and the 'stegonated' one.


Well... crack this one instead of the previous one, if you prefer :-)
Of course to reach the advanced page is not very important if you do not contribute to it as well... if you send to me your own reversing approach, once you have reached that page, I'll publish it -there- with the other ones (see below). Choose whatever handle you prefer, send anonymously and without a return email address only if you really find you should)
What's on the advanced URL?
As of today 23 September 1998, on my 'advanced steganography URL', you'll find

 +ReZiDeNt's lazy brute force approach

 zeezee's "source code reversing"

 caprine's approach

 Massimiliano's "anticontraband" own utility (!) 

 an essay by Fabian Hansmann (Steganos' Author): Fighting steganography detection

and then:... (of course these links won't work)

Jean Flynn's "A Journey within Steganos"
("How to find the Fravia's Advanced Steganography Page the hard way")
10 February 1998

Caprine's short answer to Jean Flynn
("Let's work together")
12 February 1998

Joe Peschel's Steganos, The Duke of Earl, and The Dancing Men
("Cracking the T_tamra7.bmp")
04 March 1998

Edi's work
("I had to reverse engineer steganos again, on my own")
26 March 1998

Caprine's beautiful story A great dragon known as Steganos
(Steganos Key Relief (Reducing the key search burden))
22 April 1998

Gary Benson's Unconventional Access: My way into the Advanced Steganography pages
(Steganos Key Relief (Reducing the key search burden))
23 September 1998
Here you have, as 'teaser' my own comments to Fabian's essay:
Well, for once I'm hosting an essay of a person that does not use handles nor avatars nor nicknames: Fabian Hansmann, the Author of Steganos, one of the most interesting Stenographical applications on the scene. His idea of using a benign virus in order to spread noise is interesting, yet not new (some +masters have already prepared long ago a 'benign' cracking virus -antibil7.com- that registers Micro$oft's timelimited targets WITHOUT NOTICING the owner of the PCs where these targets are found :-)
So Fabian's idea can be implemented if needs be, moreover we will of course begin ourselves, during 1998, to 'deepen' (in a reversing sense) our knowledge of the whole steganographical existing bazaar... and I'm happy that we'll work hand in hand with steganographical experts (and nette Leute) like Fabian (and maybe other Authors as well as it seems).
Another hint
Here you have as teaser a 'light' version of Jean Flynn's essay (that you will find complete on the advanced page): A Journey within Steganos, you should be able to figure out the advanced page entrance reading this... that is, if you work a little :-)
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