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CPallini wrote: BTW I've to admit I'm even more curous about your ideas, 'cause I cannot figure out a method for hiding info in a plain text file, but probably I'm lacking of imagination. Of course, I know, if someone will find a good trick then it probably will remain a secret.
In my case I wasn't trying to "keep the same content" or "hide text" per se.... but I started wondering about text and public and private key systems and anagrams.... odd combination there. But what if you tried to take a sentance, and given the letters to hide and a given text, you created a new text which was a constrained anagram such that you could decode it later. It is still text, though now may not make much sense. But if you had the original text, which was the majority, could you then extract the remainder and retrieve the word anagram. Say one word per sentance, or one letter ever xx letters, or something like that. The net result is more like constrained anagram poetry/writing than encryption, but would certainly be a bugger to solve without knowing what was added or what the original text was. 
See, I wasn't trying to keep the original text, I know that is too difficult, but keeping the original properties, i.e. an anagram of the original text and keep it as text. You could even do a letter substitution based on some formula, and then anagram. Knowing the original text you should be able to find out what letter was added Talk about a large key! 
for instance.... hiding "code project" within the text "four score and seven years ago our fathers brought forth a new"
would be
"A Decrescendo Nervous Of A Seafarer Yoghourt Pros Cab Fetter Wrought John"
Interleaved encryption.  It is text, but a complete jibberish unless you knew what one of the halves was. You could even constrain it such that you chose an anagram that collapsed one space and added one letter. Though I think the latter would be too constrained and give itself away. The hard thing about interleaving text is fooling yourself into thinking that it is good because you WANT it to be good (self-bias).
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
modified on Monday, March 31, 2008 5:04 PM
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OK. That makes sense. Probably you can also avoid to anagram, but then I suppose you'll need a bit of AI (for instance, you may add to the original text redundant sentences or unnecessary details - as novelists already do - most of them full of salt-bits but also containing the hidden message letters).
Uhm...Maybe the above resembles steganography...
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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CPallini wrote: you may add to the original text redundant sentences or unnecessary details
yeah... my problem with that is that if the text is not already completely unknown, or original (pretty hard writing a completely original piece of text every time you want to hide another set of text), then if you constrain it too much you can give clues to the original text and thus the hidden text (inserted items) as well. No, I would rather it be complete jibberish than leave any of the original text. But again, as I just added above, that could easily be self-bias.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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If you mix this thread with the recent one in the lounge about the stuff circulating the web on permuting the letters within a word whilst retaining the human readability, here is another (new?) method of hiding messages within human readable text. The information is actually in the permutation used. Damn, now I've told everyone so I can't apply for the patent...
Then again, maybe those messages circulating the web demonstrating the readability of permuted words actually contain hidden messages....
Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."
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Hey Peter, do you hear voices whispering in your ears?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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CPallini wrote: Hey Peter, do you hear voices whispering in your ears?
The spaces in your message are SO RUDE!! Can't you see it?
Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."
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If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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I'm glad this new thread was started, otherwise I would have missed the original having been away for a few weeks - what a laugh!! That guy was certainly persistent.
The only way I can think of hiding data in text is to use a key/index of some sort - take the first letter of the third word, fourth letter of the thirteenth word etc but this would require either the key to decode it or for the text to be specifically arranged so that certain letters are in certain positions, neither of which is practical or secure. If that is the method then it certainly isn't new - didn't Napoleon or some such character use the same method?
Apathy Rules - I suppose...
Its not the things you fear that come to get you but all the things that you don't expect
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I never claimed it to be revolutionary and its very very simple.Give ur email and i will send u the files.Sorry for being late.My net was down for the last two days.I told u guys...i am just a novice in compared to you.But what excited me was...all the steganography softwares available on net changes the file size and appends the data.
As i know u guys are far more superior than me so i just came here to learn not to prove anything...Anyway...give me ur email i will send u the files.
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Oh don't worry. Indeed, as El Corazon pointed out, my sarcasm was bad. I must apologize to you.
However, if you want to send me the files, I'm going to sent my address to you soon.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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Definitely wanna send u the files.Plse get me ur email.
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Hi,
I sent you my e-mail address, but I've received no file yet.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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The file has been sent to you; however it got hidden perfectly between the previous
and next messages, so you can't notice it unless you apply the newest decoding
algorithm to it first.
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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Have you gotten the file yet?
She's falling hard for me.
I can see it in her eyes.
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Nope. 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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It was a fairly ambitious undertaking, defying reality like that.
What has the future in store for this strange being, born of a breath, of perishable tissue, yet Immortal, with his powers fearful and Divine?
What magic will be wrought by him in the end?
What is to be his greatest deed, his crowning achievement?
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If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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function [z,y,wmax,xmax]=Condition(A)
[m,n]=size(A); % Get the dimensions of A
w=ones(m,1); % Start with initial guess eigenvalues
imax=60;
tol=10^-10;
for i=1:imax
[kk,k]=max(abs(w)); % Returns the indices of the maximum w values in vector k
z=w/w(k); % Normalize w with respect to maxw=w(k)
w=A*z; % Calculate w again
wmax=w(k); % z(k)=1
r=norm(wmax*z-w); % Use Euclidean form (norm(w,p) = sum(abs(w).^p)^(1/p))
final=[i,wmax,r,z'];
if r
end
B=inv(A);
% Get the dimensions of A
x=ones(m,1); % Start with initial guess eigenvalue
for i=1:imax
[kk,k]=max(abs(x)); % Returns the indices of the maximum w values in vector k
y=x/x(k); % Normalize w with respect to maxw=w(k)
x=B*y; % Calculate w again
xmax=x(k); % z(k)=1
r=norm(xmax*y-x); % Use Euclidean form (norm(w,p) = sum(abs(w).^p)^(1/p))
final=[i,xmax,r,y'];
if r
end
end
end
xmin=1/xmax
wmax
condition=wmax*xmax
And An erro occurs;
Error in ==> Condition at 2
[m,n]=size(A); % Get the dimensions of A
How can I correct it? 
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Does it not give you any more details of the error?
I'm assuming this is being run in a script? Can you replicate the script step by step in the command window? - This might give you some more details about the problem when it pops up.
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Write a MATLAB® function to calculate the condition number of a symmetric square matrix of any size by means of Eigenvalues:
§ The power method should be used to calculate the Eigenvalues.
§ The script (function) should give an error message if the matrix is not square and/or is not symmetric.
§ The result of the built-in MATLAB® function “cond” should be displayed in addition to the results of the power method.
For example:
function [condPower,condMatlab]=NameofFunction(A,…)
…
…
condPower=…;
condMatlab=cond(A);
fprintf(‘Condition of matrix calculated using the Power method is %5.2g and using cond(A) is %5.2g \n’, condPower,condMatlab);
......
.......
.......
This is my Project And I cannot Do it by myself.Please help me.
Mail Mail adress; weicell@yahoo.com
1. Write a MATLAB® script to solve the following Continuous Stirred Tank Reactor (CSTR) problem using Gauss-Siedel iteration. Five CSTR’s are connected in series. Find the exit concentration from each reactor.
Assumptions for the system are:
§
ki
Steady state system
§ First-order irreversible reaction in liquid phase AàB
§ No change in volume or density of liquid
§ Rate of disappearance of solute in reactor given by: Ri=VikiCi mol/h
Reactor 1
Reactor 2
Reactor 3
Reactor 4
Reactor 5
Vi (L)
100
150
75
40
80
ki (h-1)
0.1
0.2
0.3
0.5
0.3
Hints: First set up the material (mass) balance equations for each of the reactors
Remember: input-output-disappearance by reaction-accumulation=0, where accumulation will be zero for a steady state system.
You will have 5 equations and 5 unknown variables Ci, where i=1:5
Make sure the system of linear equations is diagonally dominant.
This is The Second one.PLease Help me I am n a hurry,
I have to send it to my instructor on sunday...
Please..  
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weicell wrote: PLease Help me I am n a hurry
No wonder you are in a hurry.
Thanks but no thanks, I've done all the exams I intend to do.
Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."
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Because I am tring to do this project about a week,But I cannot Do it..Just help me ,I appreciate that.
Why you say "You want us to do your mid-term exam for you??" ?
Is it a shame For me?
I don't think so , I'm just waiting for help..Because I AM desperate!
If I cannot send this to my instractor,She will gave me F-,Than I cannot graduate this year!!
This is UNfair.
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weicell wrote: If I cannot send this to my instractor,She will gave me F-,Than I cannot graduate this year!!
This is UNfair.
It sounds entirely fair to me. Why should you be allowed to graduate if you're not ready? If you haven't done sufficient preparation, that's your fault, not ours. No one is going to help you cheat and gain a qualification you don't deserve.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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