Deadfish Riddle
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Re: Deadfish Riddle
A guess?ATTN: Zenith
to curb your puzzle pangs, ok lemme find one....
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The other challenge is still up for grabs for 10k credits, but so will this one:
PROBLEM 3: 10K CREDITS
Keith's friend gave him a message. Unfortunatly Keith's friend encrypts every message he gives Keith, help Keith decrypt the following message.
The Code:
hlpwz yomba aapa aa s bjo hmzqm yt yxbq mh amko mb xesamv kh rhgtpni ytf pmi napa hprk ba gbyj flvv xh odg zkfuv mmavt aj hhpcg akfuv klnzk mvk wrv cmi c im sxvet avdt xh gwi cmi mgcb oz ral awy ral jqlg oa utpnihwayxvet
Hint: The first letter was not changed.
Code:hlpwz yomba aapa aa s bjo hmzqm yt yxbq mh amko mb xesamv kh rhgtpni hello keith this is a big block of text to make it easier to decrypt ytf pmi napa hprk ba gbyj flvv xh odg zkfuv mmavt aj hhpcg akfuv klnzk for you this part is only here to add words using up space words stuff mvk wrv cmi c im sxvet avdt xh gwi cmi mgcb oz ral awy ral jqlg oa how are you i am great hope to see you soon by the way the flag is utpnihwayxvet cryptoisgreat
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Re: Deadfish Riddle
*CORRECT*A guess?
Code:hlpwz yomba aapa aa s bjo hmzqm yt yxbq mh amko mb xesamv kh rhgtpni hello keith this is a big block of text to make it easier to decrypt ytf pmi napa hprk ba gbyj flvv xh odg zkfuv mmavt aj hhpcg akfuv klnzk for you this part is only here to add words using up space words stuff mvk wrv cmi c im sxvet avdt xh gwi cmi mgcb oz ral awy ral jqlg oa how are you i am great hope to see you soon by the way the flag is utpnihwayxvet cryptoisgreat

That makes 20k for you!! I'd like to see your work :3
PROBLEM NUMBER.... FIVE I THINK?
Keith has intercepted a message meant for a spy but has only managed to decode some of the simpler, more common parts. Everything he has not decoded is in caps. Can you decode the message?
WOOD the FREUD and the PECAN at DODO PUNT's, then CAP the HEWN on a SAX ECO to FOE your BIAS. - PIERRE
Notice about credits: This "spon con" if you will ends at the end of the week on Saturday, credits will go out then.Last edited by danceflashrevo; 05-19-2015, 11:00 AM.
Why are you here?
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Re: Deadfish Riddle
llyair you're so clever o:
I'm definitely not intelligent enough to actually answer these questions,
I feel like a goldfish compared to you eggheads. But I love to challenge myself and these puzzles are definitely stimulating
The spoiler is not an answer to No.4, just my silly idea on how someone might go about finding it
My guess is the entire file is a Markov chain.
Using python's counter object someone who actually knows what they're doing could make some kind of text probability calculation.
It's probably be something simple like:
Of course I have no idea what I'm saying, but any data collected successfully from the frequency in which these words are appearing could be useful in determining the probability distribution. *shrug*Code:from collections import Counter text = open("markovhaystack.txt").read().lower() letter_freqs = Counter(text) word_freqs = Counter(text.split())
Which I'm blindly assuming is important for no reason at all. ^^
Just an idea. Enjoy yourselvesComment
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Re: Deadfish Riddle
Yeah I was wanting to see how you go about it using Markov chain as well. Unfortunately I'm at school and Wikipedia is blocked ;~;
And mourningfall, that's not silly! Try to make something with that! I believe :3 (and I feel like a goldfish too, a lot of these are above me but I thought I'd put up a fun little thinking contest haha. I guess we can learn a bit here too right?
)
Oh yeah I'll give everyone credits for trying as well. 5k each sounds about right, I feel generous.
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Re: Deadfish Riddle
My guess would be that the entire file was generated from some original file using a Markov chain process. Notice that the document has over 300,000 words but only about 1500 words or so are unique.
When I say generated from an original file, I mean in the following way:
Construct a markov chain where each state is a word. The probability edges between two states in the diagram (say an edge going from word X to word Y) would correspond to the probability that word Y immediately follows word X in the original document.
From there, to create the pseudo-randomly generated document, one first picks a word (perhaps at random) and then chooses the next word randomly according to the probability distributions given in the markov chain. Repeat this process as long as desired.
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To reverse engineer this process, one can build a markov chain for the pseudo-randomly generated document and due to the large size of the document, it should closely resemble the markov chain that would have been obtained if we were to construct the markov chain we would have gotten if we were to do the same process on the original document.
Whether or not it'd be feasilble to get back the original document after constructing the markov chain is another story. Putting together the over 1400 unique words by hand would be too time consuming. However, notice that the markov chain process appears to be case-sensitive and it defines "words" as characters separated by whitespace...i.e., notice how the word "build" in the pseudo-randomly generated document always ends in a period. Also, there's likely to be many words that only have a single transition to another word, so it's obvious those words would be adjacent in the document.
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If anyone wants to give this a try, go for it. I'm too lazy to implement this right now though xPLast edited by benguino; 05-19-2015, 05:15 PM.AMA: http://ask.fm/benguino
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Originally posted by Spenner(^)> peck peck says the heelsOriginally posted by Xx{Midnight}xXAnd god made ben, and realized he was doomed to miss. And said it was good.Originally posted by Zakvvv666awww :< crushing my dreams; was looking foward to you attempting to shoot yourself point blank and missing
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Re: Deadfish Riddle
Actually, upon closer analysis, it seems that not only is it using the previous word to determine the next, it seems to be using the previous x words (not sure on the exact amount). For example, notice that if we have the phrase ""Can computers", then the next word is always "think?"". However, there are many words that follow the word "computers" in the document so it must be using multiple words to determine what the next word is.
EDIT: DERP...just noticed this...all the dates in the document are either missing or have a placeholder of 0...HMMM
EDIT v2: Here is a listing of all the words that follow every pair of adjacent words in the document (along with the count). I didn't include any pairs of words with periods because it seems that every time a new sentence begins in the document, the next word is randomly selected in a way that doesn't fit the markov chain model.
Code:C:\Python34\python.exe C:/Users/Reuben/PycharmProjects/FFR_Markov/main.py Algorithms and data 1076 the application of 1715 is the systematic 547 now 607 case, 561 conceptual 565 case 578 study 3258 design 549 scientific 553 practice 530 field 550 foundations Contents History. 586 discipline revolves around 534 intelligence is becoming 568 computer networking and 547 deployment of computers 534 that computing is 568 Artificial intelligence This 584 is 568 disciplines of computer 573 human genome became 558 requirements for the 478 and social intelligence. 581 situations 552 near-ubiquitous user base. 605 classical theory of 563 demonstrated a digital 146 and retrieve large 615 (ACM) and Computer 573 The report also 115 factor contributing to 585 "Still, working with 593 Naphthalene- D-balls.png u0 572 to study computation 512 many initially believed 584 analysis, among others. 570 CE) and the 548 University in . 538 description of computation, 523 numerous dedicated academic 556 boys considered computer 470 0 by Association 546 predate the invention 534 circuits, as well 519 start the whole 587 Alan Turing, and 567 an important factor 1143 theoretical 569 part 534 The relationship between 598 architecture Compiler design 565 while fields such 563 computing, a number 545 and algebraic data 537 characterization, and classification 526 its internal maintenance 564 over what the 559 and coding to 528 theory 520 Computing Sciences Accreditation 554 of resources are 496 "filmed" now on 419 a computer consisting 525 memory 541 system. 571 to 585 has 1116 certain computer science 542 about computers than 525 structures in a 541 an embedded component 565 practical evaluation of 570 also teach computer 579 of Informatics of 550 calls for grants 561 representation, processing, storage, 543 of commonly used 499 often used, e.g. 583 disciplines, such as 474 and mathematical aspects 583 which can be 525 anim.gif Singly linked 582 than two years 606 a number of 1062 written in 00 568 these foundations Contents 586 the abacus have 524 [computer was frustrating 560 ? 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Codes are 5 the late 0s 539 fifties 521 0s, 579 states have adopted 332 one letter in 585 of three separate 541 names have been 563 the Parallel Random 549 parallel computation, distributed 547 you would have 587 to another) and 560 Despite its name, 377 short 370 for its intended 520 the United States 1086 States, 538 making computers and 558 Harvard Business School 542 to perform those 535 in 490 Turing, and there 567 a French article 546 of image data. 518 industrial use, tool 571 analytical engine, Ada 576 which 540 be computed and 542 bridge the field 575 and society - 526 feature the theory 585 and verification of 523 Robotics Medical image 539 including Petri nets, 545 treatment, while not 531 employs deductive reasoning), 606 addresses in memory. 564 ? Certain departments 2 of automating algorithmic 536 0 at current 519 no more about 525 when he released 598 fundamental contributions to 525 Process finished with exit code 0
Last edited by benguino; 05-19-2015, 06:50 PM.AMA: http://ask.fm/benguino
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Originally posted by Spenner(^)> peck peck says the heelsOriginally posted by Xx{Midnight}xXAnd god made ben, and realized he was doomed to miss. And said it was good.Originally posted by Zakvvv666awww :< crushing my dreams; was looking foward to you attempting to shoot yourself point blank and missing
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Re: Deadfish Riddle
Ok, I'm convinced that x=2 (i.e. only the previous two words are used to determine the next word). I say this because the phrase "vessel for the" pops up quite a bit in the document. In whatever the original document is, one would think that the phrase "vessel for the" only appears once.
Thus, if the markov chain model were to use three or more words to determine the next word to pick, "vessel for the" would always be followed by the same word (whatever the word was in the original text). However, as we see, in the document given we have things like "vessel for the support", "vessel for the implementation", "vessel for the precise", etc. The reason there are so many is because the TWO word phrase "for the" is very common (both in irl and most likely in the original document).
tl;dr The thing uses the previous two words to determine the next word.AMA: http://ask.fm/benguino
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Originally posted by Spenner(^)> peck peck says the heelsOriginally posted by Xx{Midnight}xXAnd god made ben, and realized he was doomed to miss. And said it was good.Originally posted by Zakvvv666awww :< crushing my dreams; was looking foward to you attempting to shoot yourself point blank and missing
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Re: Deadfish Riddle
(Most of) the text used in problem 4 comes from this wikipedia page: http://en.wikipedia.org/wiki/Computer_science.
It may be a Markov chain made from the wiki page and the hidden message.
My best guess to solve it is to look for words in the file that are not in the wikipedia page.Comment
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Re: Deadfish Riddle
Ooh nice, it's really interesting to read all the thoughts about these riddles!
This was my work for #3, not sure if there was a better way to do it? xD Feel free to add c:
To decode each letter of the message, subtract the index of the previous decoded character from the index of the current character in the message (a to z wraps around, indices start from 'a' as 0).
Indices:
So for hlpwz:Code:a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
This is a function written in MATLAB (felt like doing MATLAB I guess) for decoding the entire message.Code:hlpwz h --> 'h' already decoded he --> since 'l' is 11 and 'h' is 7, 11-7=4, and 4 is 'e' hel --> ('p', 15) - ('e', 4) = ('l', 11) hell --> ('w', 22) - ('l', 11) = ('l', 11) hello --> ('z', 25) - ('l', 11) = ('o', 14) For 'yomba', start with using the 'o' from hello as it's the last decoded character. For the rest of the message, wrap the subtraction around from a-->z if the value is less than 0 (basically, mod 26). Leave spaces where they are.
Code:function msg = decode(s) letters = 'abcdefghijklmnopqrstuvwxyz'; msg = zeros(1, length(s)); %preallocate decoded msg msg(1) = s(1); midx = 1; %index in msg for i = 2:length(s) c = s(i); if (c == ' ') msg(i) = ' '; else msg(i) = letters(mod(strfind(letters, c)-strfind(letters, msg(midx)), length(letters))+1); midx = i; end end msg = char(msg); endLast edited by llyair; 05-20-2015, 11:00 AM.Comment
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