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Author Topic: Cemetech Contest #15: Crypto Golfing  (Read 5790 times)

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Offline Juju

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #15 on: December 22, 2015, 05:51:36 am »
Yay another challenge~
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Offline KermMart̕ian

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #16 on: December 26, 2015, 02:53:09 pm »
Quote from: jonbush
If you haven't figured out Challenge 2 yet, here's a hint:

%26
I'm Kerm Martian and I approve of this message. :D Good luck, everyone. I notice we haven't quite gotten as many entries as for the first challenge, so I hope everyone who is stuck on this one (or forgot to enter so far this week) will redouble their efforts.

Offline c4ooo

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #17 on: December 26, 2015, 09:18:24 pm »
(click to show/hide)

HAPPY HOLIDAYS TO CEMETECH AND KERM! (not the solution btw)

Edit:  35 bytes in axe, although the IO is via stdIn / out and not ans <_<

Edit: stdIn stdOut hehe XD
« Last Edit: December 30, 2015, 10:04:30 pm by c4ooo »

Offline xlibman

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #18 on: December 28, 2015, 07:31:02 am »
c4ooo not to nitpick, but all-caps and smiley abuse (can probably cause cancer and) should be avoided. <.< I'm glad that you got the solution, though. Good luck for future challenges.


I wonder if anyone else on CW is still participating and how well they are doing so far?
« Last Edit: December 28, 2015, 07:32:54 am by DJ Omnimaga »
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Offline c4ooo

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #19 on: December 28, 2015, 03:10:04 pm »
Yea its abnoctus and best not abused :P
It reminds me of my favorite MC PvP server avicus (avic.us iirc). They have good players / maps ect but when ever anyone uses one capital letter all the mods yell at him :P So after a long haitus i joined and shouted out something in caps about being excited to come back, i was greated by like 3 "Watch the caps please" messages  :-\

Offline KermMart̕ian

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #20 on: December 30, 2015, 04:46:38 pm »
c4ooo: Please try to avoid posting hints about the cipher. Note that the rules posted for the last challenge specify that things like constants should be changeable in the source. :)

For the past two Tuesdays, we have announced increasingly difficult challenges as part of Cemetech Contest #15: Crypto Golfing. This five-part contest tasks programmers with solving cryptography puzzles, then creating programs that can decode messages in the cipher used for each challenge. We received an overwhelming number of entries written in many different calculator and computer languages for Challenges 1 and 2, although the field has started to thin. Since another Tuesday is upon us, Challenge 3 of Cemetech Contest #15 is here! If you haven't started entering the contest yet or if you haven't completed one of the existing challenges, you still have time, and the only thing you'll lose is the (up to) 5 bonus points you get by submitting your solutions quickly. Challenge 3 is the last pure-text cipher, and if you're still stuck with it on Friday, we'll be publishing an extra hint on Friday afternoon at 5pm, Eastern Time.

Challenge 3: OEEJCYKL WK AU LTMY L WXOJWN

Good luck! To repeat the incentive, besides prestige and glory: a TI-Nspire CX and a TI-84 Plus C Silver Edition await the top two contestants.


Offline c4ooo

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #21 on: December 30, 2015, 05:00:53 pm »
" I GOT IGOTIGNUNVIRNGINRUVNIRQMVIDNCIMEOCNIM!!!!!" is random text and i clearly stated that "HAPPY HOLIDAYS TO CEMETECH AND KERM!" was not the solution. :P If you mean what i said in IRC to juju, i can understand, although to me it seemed basically a restatement of your "%26" hint  ;)

Edit: conflict solved over PM's :)
« Last Edit: December 30, 2015, 10:10:09 pm by c4ooo »

Offline xlibman

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #22 on: December 31, 2015, 09:08:58 am »
I would agree that we should keep hints to a minimum. The challenge is the fun part of this contest so if someone posts the solution online, then for this particular kind of contest it might ruin the fun. :)
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Re: Cemetech Contest #15: Crypto Golfing
« Reply #23 on: January 01, 2016, 10:13:28 pm »
*bump* Contest #15, Challenge #3 hint time:
You wouldn't put calculators on your salad

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #24 on: January 04, 2016, 08:36:08 pm »
*bump* Noting how much people are struggling with Challenge 3 and with jonbush's agreement, we have decided to release one additional hint at this time: Challenges 1 to 3 have all used ciphers that can be found in the "Classical Cryptography" template on Wikipedia. A special congratulations to the >=2 contestants who solved the challenge before this hint!

Offline Streetwalrus

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #25 on: January 04, 2016, 08:40:00 pm »
I'm a little late on this but it sounds like a fun challenge, I'll see if I can take a try at it. :)
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Offline c4ooo

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #26 on: January 04, 2016, 08:41:11 pm »
@KermMartian you should probably note that said wiki page does not render all of its content in mobile <_<

Offline p4nix

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #27 on: January 04, 2016, 08:44:52 pm »
@KermMartian so I guess I can get a senseful answer with OneTime-Pad? :trollface:
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Offline xlibman

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #28 on: January 04, 2016, 10:55:45 pm »
*bump* Noting how much people are struggling with Challenge 3 and with jonbush's agreement, we have decided to release one additional hint at this time: Challenges 1 to 3 have all used ciphers that can be found in the "Classical Cryptography" template on Wikipedia. A special congratulations to the >=2 contestants who solved the challenge before this hint!
Will contestants who solved the challenge before the new hint was given get bonus points?
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Offline KermMart̕ian

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Re: Cemetech Contest #15: Crypto Golfing
« Reply #29 on: January 05, 2016, 04:26:00 pm »
DJ_O: As noted at the beginning of the thread, solving the challenges closer to the announcement of the ciphertext gives you up to 5 extra points.

The second-to-last challenge is here, and I think it's one that you guys will have fun with. Instead of providing a ciphertext for Challenge 4, we are providing a 95x63-pixel monochrome image (of an Enigma machine!) in three formats: .8xi, .8ci, and .png. Solutions must take at least one of those formats and produce a plaintext (not image) output from the image. Programmers working on the color calculators can assume that any .8ci passed to the program will also only have black and white pixels in the top-left 95x63 pixels of the image, and those writing computer programs should only look at the top 95x63 pixels of any image passed to the program. As with the previous challenge, we will publish a clue on Friday afternoon at 5pm ET, but we encourage you to try to solve it before Friday to earn maximum points.

Challenge 4:

Download:
Contest #15, Challenge 4 input image (PNG)
Contest #15, Challenge 4 input image (8xi)
Contest #15, Challenge 4 input image (8ci)


 


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