martes, 30 de octubre de 2012

[SC] 9. Steganography

For this week the challenge was implement a steganography script using python, so, here are my pictures.

This one contain a hidden message:

Hidden Plaintext:


In a village of La Mancha, the name of which I have no desire to call to mind, there lived not long since one of those gentlemen that keep a lance in the lance-rack, 
an old buckler, a lean hack, and a greyhound for coursing. An olla of rather more beef than mutton, a salad on most nights, scraps on Saturdays, lentils on Fridays, 
and a pigeon or so extra on Sundays, made away with three-quarters of his income. The rest of it went in a doublet of fine cloth and velvet breeches and shoes to match 
for holidays, while on week-days he made a brave figure in his best homespun. He had in his house a housekeeper past forty, a niece under twenty, and a lad for the field 
and market-place, who used to saddle the hack as well as handle the bill-hook. The age of this gentleman of ours was bordering on fifty; he was of a hardy habit, spare, 
gaunt-featured, a very early riser and a great sportsman. They will have it his surname was Quixada or Quesada (for here there is some difference of opinion among the 
authors who write on the subject), although from reasonable conjectures it seems plain that he was called Quexana. This, however, is of but little importance to our tale; 
it will be enough not to stray a hair's breadth from the truth in the telling of it.

You must know, then, that the above-named gentleman whenever he was at leisure (which was mostly all the year round) gave himself up to reading books of chivalry with 
such ardour and avidity that he almost entirely neglected the pursuit of his field-sports, and even the management of his property; and to such a pitch did his eagerness 
and infatuation go that he sold many an acre of tillageland to buy books of chivalry to read, and brought home as many of them as he could get. But of all there were none 
he liked so well as those of the famous Feliciano de Silva's composition, for their lucidity of style and complicated conceits were as pearls in his sight, particularly 
when in his reading he came upon courtships and cartels, where he often found passages like "the reason of the unreason with which my reason is afflicted so weakens my 
reason that with reason I murmur at your beauty;" or again, "the high heavens, that of your divinity divinely fortify you with the stars, render you deserving of the 
desert your greatness deserves." Over conceits of this sort the poor gentleman lost his wits, and used to lie awake striving to understand them and worm the meaning out 
of them; what Aristotle himself could not have made out or extracted had he come to life again for that special purpose. He was not at all easy about the wounds which 
Don Belianis gave and took, because it seemed to him that, great as were the surgeons who had cured him, he must have had his face and body covered all over with seams 
and scars. He commended, however, the author's way of ending his book with the promise of that interminable adventure, and many a time was he tempted to take up his pen 
and finish it properly as is there proposed, which no doubt he would have done, and made a successful piece of work of it too, had not greater and more absorbing thoughts 
prevented him.

Three of these ones (the three inside the blue frame) contains the python code used to hide the information:

So, let's hack begin...


To download the code:

To download the images:

To encode information:

python -E

To decode information

python  -D

Then, enter the requested data.

4 comentarios:

  1. Este comentario ha sido eliminado por el autor.

  2. Cuando no tiene mensaje, sale basura binaria. Técnicamente podrías haber puesto que de un mensaje. Lo bueno es que semihackeaste a algunos. Van los 10 pts.

  3. Pues, semihackeaste los suficientes para tener un +1.