In this thread we shall attempt to make and break ciphers.
RULES
For breaking:
Don't ask the person who made the challenge to give you the answer. And if you do, and you get the answer and I find out you asked for help from the creator, you will not get the solved by thing and if you post it in the thread the challenge will be closed/remade with a different key.
To submit, either post in thread or PM/Steam MSG the creator, then have him pm/post/steam msg me that you beat the challenge correctly. Doing you so will have your name put next to the challenge.
For making:
Post in the thread if you want to, but PM me in case I miss it.
If someone asks you about your cipher and you give them the answer pm/msg me.
Try to tell me the difficulty of your cipher. If it isn't a well known cipher/you made it up yourself it will go in no less than hard ciphers.
[b]CHALLENGES[/b]
Easy:
[code]vacwkjaoh[/code]
By neos300(me)
Hints:
Very simple, widely known cipher.
Key based.
[b]NOT VALID, WAS UNBREAKABLE[/b]
Medium:
Hard:
Very Hard:
I'm guessing your first challenge is "facepunch", I can't be bothered to check if that's the key or that's the word the key locked.
Neither.
Edit: Woops, I accidentaly made that cipher unbreakable.
[QUOTE=neos300;25005832]Neither.
Edit: Woops, I accidentaly made that cipher unbreakable.[/QUOTE]
sorry I'm not a Pro Coder like some but I am pretty sure a cipher with a key is unbreakable without brute forcing/using a rainbow table&checking for collisions???????
I don't think anybody here is going to bother trying to decipher anything because it takes too long (in terms of effort, you gotta try all kinds of different cipher methods). My suggestion is, add some kind of rule where the thing you've encrypted has to be, I dunno, the name of a fruit, all in lowercase and no spaces. At least that way, you're not gonna get someone who comes along and encrypts "T8s73Fma6_L" with the key "9932Hg0_UiO", and it makes the challenge slightly more interesting and less tedious.
[QUOTE=thomasfn;25006249]I don't think anybody here is going to bother trying to decipher anything[/QUOTE]
You are wrong.
I actually tried a few things (mostly variations of the Caesar cypher since the whole cyphertext is lower-case letters), but nothing worked. I would've tried frequency analysis, but the text was way too short.
I think it really might be unbreakable like he said. If the key is as long as that plaintext, it could essentially be something like a one-time-pad.
Why won't you program a keygenme instead for us to reverse engineer?
Basically you've setup a system that's similar to this equation:
x + y = 20
Find x.
[QUOTE=ROBO_DONUT;25006458]You are wrong.
I actually tried a few things (mostly variations of the Caesar cypher since the whole cyphertext is lower-case letters), but nothing worked. I would've tried frequency analysis, but the text was way too short.
I think it really might be unbreakable like he said. If the key is as long as that plaintext, it could essentially be something like a one-time-pad.[/QUOTE]
According to a website I read, it is unbreakable. It was a vignere cipher, the key was pretty random, non repeating, and as long as the cipher text.
So yeah, pretty much unbreakable.
Now we just need people to cntribute more ciphers so we can actually get some solving in here.
ok, easy as hell
wrpdwrhv
[QUOTE=pikzen;25007818]ok, easy as hell
wrpdwrhv[/QUOTE]
It's funny because it's impossible and that's not even a word. Derp.
[QUOTE=xAustechx;25007918]It's funny because it's impossible and that's not even a word. Derp.[/QUOTE]
possible AND is a word. Derp elsewhere.
[QUOTE=Gbps;25007319]Basically you've setup a system that's similar to this equation:
x + y = 20
Find x.[/QUOTE]
x = 20 - y
:banjo:
y= 20- x
x= 20- y
x= 20- (20- x)
x= x
SOLVED
What? Where did the Y go? :(
Also, When you do something too one side, you have too do it too the other side too maintain it being equal.
[QUOTE=coolrider102;25008856]What? Where did the Y go? :(
Also, When you do something too one side, you have too do it too the other side too maintain it being equal.[/QUOTE]
He did.
What he did was valid, just pointless. He just established that X equals X, which was a given. He didn't "solve" anything though if that's what you thought.
Ok,
RGPKU
crack it.
[QUOTE=dag10;25009130]He did.
What he did was valid, just pointless. He just established that X equals X, which was a given. He didn't "solve" anything though if that's what you thought.[/QUOTE]
Oh, :saddowns:
Solve this cipher:
Y3d@d0^!d0ff-m
[editline]06:32PM[/editline]
Time's up, the answer was "pineapples"
[QUOTE=pikzen;25008000]possible AND is a word. Derp elsewhere.[/QUOTE]
Oh shit I read it wrong. I thought you were posting an answer to the impossible one. My bad.
[QUOTE=Soda;25006065]sorry I'm not a Pro Coder like some but I am pretty sure a cipher with a key is unbreakable without brute forcing/using a rainbow table&checking for collisions???????[/QUOTE]
The ideal for a cipher is for there to be no way to find the key other than by brute force, because you can make the key long enough to ensure that brute force is infeasible. But ciphers can have mathematical weaknesses that allow an attacker to recover the plaintext (and possibly the key) using analytic techniques in much less time.
Much research is done in this area; read about [url=http://en.wikipedia.org/wiki/Cryptanalysis]cryptanalysis[/url], partuclarly the variety of [url=http://en.wikipedia.org/wiki/Cryptanalysis#Methods_of_cryptanalysis]methods[/url] available. [url=http://en.wikipedia.org/wiki/Frequency_analysis]Frequency analysis[/url] is one method that's often effective against old ciphers, and it doesn't involve advanced mathematics so it's relatively understandable to people not trained in the field.
[QUOTE=VeryNiceGuy;25010740]Sdbc cx pnc cqrb bcjacnm, R pdnbb R'uu yxbc cqrb. :-)[/QUOTE]
"just to get this started, i guess i'll post this"
Post more, I love these kind of stuff.
[editline]01:12AM[/editline]
Ceasar chiper, shifted 9 steps by the way.
Done by hand too. :-)
[editline]01:34AM[/editline]
Here's a virtually un-crackable cipher. You need to figure out my key to get it!
[quote]Rmj aqyl zsl ve-impuhr ihll wf csny pzjw ntfw.[/quote]
There's a secret message encoded into this image:
[img]http://anyhub.net/file/encoded.png[/img]
[url=http://anyhub.net/file/turbsteg.exe]You may need this tool to get it out.[/url]
The passphrase I used isn't exactly obscure, it's fairly obvious.
When I saw binary I decoded it and felt special and clicked OK and saw it already decoded..
[editline]02:50AM[/editline]
you guessed the secret message well done
[QUOTE=VeryNiceGuy;25013965]When I saw binary I decoded it and felt special and clicked OK and saw it already decoded..[/QUOTE]
Protip: this is not the secret message:
[code]쥨鯼槬ꊐ⳶檳≽岸�㉧ꎉ埍⳵ㆮµ촠䣧楉ো�銟릆ꀿ馓ƪႨ炛嘥Ӝ桝듍腒ﲍꚘ[/code]
[editline]12:51PM[/editline]
[QUOTE=VeryNiceGuy;25013965]you guessed the secret message well done[/QUOTE]
oh lol
[editline]12:51PM[/editline]
nice work ;)
Yeah I got that rather quickly, then I got 'you guessed the secret message well done'. :)
[editline]5[/editline]
do i get a cookie? :v:
[QUOTE=VeryNiceGuy;25014093]
do i get a cookie? :v:[/QUOTE]
Not for that one, the passphrase was super obvious.
You get a cookie if you figure this one out (don't worry, I've dropped a couple clues)
[img]http://anyhub.net/file/scientific_notation.png[/img]
[QUOTE=turb_;25014238]Not for that one, the passphrase was super obvious.
You get a cookie if you figure this one out (don't worry, I've dropped a couple clues)
[img]http://anyhub.net/file/scientific_notation.png[/img][/QUOTE]
Are those vague orange lines a text? I tried making it more readible, but I couldn't figure it out.
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