Questions tagged [cipher]
A cipher is a simple method of modifying messages to make them unreadable, but still possible to recover. Common ciphers are Caesar, Vigenere, Atbash, and several types of substitution cipher. Other ciphers include polynomial ciphers such as Playfair, Foursquare, etc.
1,335
questions
3
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Three letters, one dial
You, a great scientist, is being held hostage by aliens. They want to test human intelligence and see if the human race is worth to collaborate with.
According to the aliens, if you manage to escape ...
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vote
2answers
61 views
Encoded Morse Code Interception
A message has been intercepted in Morse code coming from one unidentified station to another, but the radio operators couldn't make any sense of it. Later, another message was intercepted. Here are ...
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Jpe vsm upi ;ry dp,rpmr lmpe yjsy upi str idomh s lrunpstf djogy vo[jrt [on hold]
O,shomr yjsy upi str rcvjsmhomh s )drtord pg_ yrcy ,rddshrd eoyj s [rtdpm ejp od mpy sestr yjsy upi str idomh s do,[;r lrunpstf tohjy djogy rmvpfrt/ Jpe vsm upi jomy yjr,. ejsy upi str fpomh. dp yjsy ...
2
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0answers
139 views
Zed's Note: Famously Infamous
My friend Al and I constantly bicker. One time, he proudly boasted that he can crack any cipher ever written, so I put out a little wager: if I can stump him with any cipher I write, he would have to ...
3
votes
2answers
195 views
What is the hidden passcode?
The passcode is hidden in these sequences of numbers. Can you find what it is?
28
votes
1answer
387 views
3
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0answers
207 views
The Weird cipher password?
During your search to the ' great hidden computer virus ' , you realized that you are just a password from accessing it. Frantically , you searched for a clue that might help you . At last you ...
7
votes
1answer
158 views
Density type puzzle 2
Here's another puzzle of this type. Perhaps my next one will be complex enough to require the full $72$ x $72$ size.
Final answer: (5,2,5)
4
votes
0answers
107 views
Message for my club members
Two people in particular have come to my Codes and Ciphers Club almost every week. One of them is always expecting a certain message to appear in the weekly puzzles, so of course I can't include it, ...
6
votes
1answer
567 views
Super Secret Cookbook
You requested the password for a super secret cookbook and received an SMS with the following content:
77733666688833 2555555 777772222337777 2663 777337555222233 84433 6688622337777777 9444844 ...
6
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0answers
248 views
Recurring Meeting
The computer scientist's assistant is late at work once again, trying to once again decode their bosses directions for the day. Under meetings, the boss has listed only a single meeting:
...
24
votes
1answer
2k views
The first Density™ Puzzle!
Welcome to the very first puzzle in a new series! It's all about (hopefully) exploring new ways of creating puzzles, as densely as possible.
If you'd like to create your own Density™ puzzle, the ...
4
votes
0answers
91 views
Cryptic Puzzle for Puzzlers: PART II
You are a cryptanalyst who works for the US Army. You have been intercepting what is believed to be enemy spies' communiques. However, the documents are very normal looking:
Good Morning,
The lasagna ...
3
votes
1answer
230 views
Where is the girl?
A girl called Claire suddenly disappeared two weeks ago. She left strange notes before she left. Her parents asked everybody to help find their girl.
Last diary entries:
[12.02.2019]
Prep for mom ...
1
vote
2answers
232 views
A Cryptic Riddle for Puzzlers
You asked your friend Joe, (whom you know to be avid about cryptography), who he would ask to dance with at Prom and you receive later inside your locker signed by Joe this:
Happy as a Lark in a ...
8
votes
0answers
406 views
An enrypted clue for the police
A well known German drug dealer contacted his accomplice with an encrypted note. The police caught the accomplice during a drug deal and found the note in his backpack.
Note:
(For those who can't ...
3
votes
3answers
198 views
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113 views
Questionable Cipher
I have received a rather peculiar cipher and in all my years of crypto, I have never seen a cipher like this. The cipher is Numeric, Uppercase mixed with Lowercase. The only hint I'm given is "Capital ...
4
votes
2answers
211 views
Cipher: First time
So, this is my first puzzle here and it is a cipher. But it starts with an instructional poem:
The cipher below
Shouldn't forebode
It is but a version
Of a known code
Start at a place
...
4
votes
0answers
187 views
10
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2answers
473 views
What is lost can never be saved
Donnie and Violet are Ivy-League college students, and don't have fancy names or costumes or anything. But they do have superpowers and are attempting to track down and stop whoever is trying to ...
13
votes
1answer
200 views
Welcoming Cipher Puzzle
Please leave this puzzle for users with less than 200 rep.
Each of the following lines until the last provides a significant clue for solving the next cipher.
Letters have a natural order
C SEA WRA ...
1
vote
1answer
281 views
Hiker's Cabin Mystery | Pt. XVI
It's been a whiiiiiile since we've had one of these!
You continue on through the forest and enter the labyrinth, once more. And again, you find a small piece of paper: ...
2
votes
1answer
239 views
How to solve this cipher?
I'm given the cipher ESELUBRKXDBWTHARE and am told that it's a J. Bond quote. The only cryptography techniques I know are caesar ciphers and substitution ciphers. I learnt the vignere cipher after ...
17
votes
1answer
433 views
Flying pigs arrive
You’ve built pens for flying pigs. Being, well, flying pigs, they pick their own accommodation in full accordance to their preferences. Can you figure out what creature joined them?
Pigs only occupy ...
3
votes
0answers
156 views
All Aboard the Factorio Train to Far Harad
It’s been a while since you started up your Factorio game and you are trying to remember what you had done with your four trains. Use the clues below to work out which deposit each train is collecting ...
1
vote
1answer
77 views
Missing number in a 5x5 table
I'm trying to find a solution for the following puzzle. A friend sent it to me and I know that he didn't create it and that's about it for the original source; I tried to find it on the net but I ...
4
votes
1answer
107 views
Phonetic Substitution Cipher
This cipher uses a unique phonetic alphabet.
Consonant sounds (not necessarily in the text):
m b p f v r
l d t s z y
n j ch sh zh* w
ng g k thin** this** h
*Zh refers to the s in conclusion or the ...
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votes
1answer
117 views
Solve this simple Zipper Cipher
This is a very simple variation on a very simple cipher.
I'm sure one of you geniuses on this site will be able to figure it out without any hints (aside from the title). I encourage you to use a ...
2
votes
1answer
138 views
How do I answer this?
So, I'm trying to figure out this weird code that was sent from one of my friends. Could someone please tell me the sentence within?
30 30 31 31 30 30 30 30 20 30 30 31 31 30 31 30 31 20 30 30 31 31 ...
2
votes
1answer
101 views
An Autokey Cipher (Now with Added PHP Code)
15.26.32.25.23.25.19.11.5.20.3.3.6.12.0.23.4.8.8.8.25.4.43.32.0.3.7.4.3.11.10.18.35.7.4.8.5.21.1.5.58.13.38.3.2.1.62.2.55.10.4.36.14.2.1.3.9.71.59.2.24.13.79.73.14.10.12.3.3.8.65.77.40.75.7.7.74.42.3....
5
votes
1answer
218 views
Room 213: Because of the Reindeer
Credit: Brandon X.
This is part of a larger riddle room puzzle. Other rooms:
Room 11
Once you enter the door labeled “3”, the door immediately shuts behind you. You are immediately in a room of ...
11
votes
2answers
469 views
A puzzling nature walk
While wandering through the forest
Taking lots of snaps
I found a mossy clearing
Where my pup could take a nap
I glanced around the bushes
I heard a rustling sound
And there I spied a crumpled note
...
2
votes
0answers
67 views
Peterhead Codes and Ciphers Club: Weekly Challenge II
This is another cipher-based challenge I created for my club. The story you uncover is generated from Crusader Kings II. The events of this challenge precede those of the Reverse Engineering challenge....
7
votes
2answers
302 views
Reverse Engineer These Five Ciphers
This is the latest material I have made for my Codes and Ciphers club. It involves showing both the ciphertext and the plaintext for messages using each of five ciphers alongside another ciphertext ...
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votes
1answer
76 views
code the following word using the sample code logic
Sample
apple = btqreqemf
mango = ntbreoehp
banana = ctbreoebob
code:
orange = ?
9
votes
3answers
305 views
Know your primes
Did you know that a prime, regardless of its base, is always a prime?
I am looking for a prime. It’s the largest of its kind.
In solving this puzzle, the answer you may find.
...
14
votes
2answers
626 views
A journey through letters and numbers
In the year 2407476658354979366708415043923125501315337890943021769230219230892355006879909214795402102204224, as cosmopolitanism is in the air and companies are more than ever bound to ...
11
votes
1answer
258 views
Peterhead Codes and Ciphers Club: Weekly Challenge
This is one of the cipher-based challenges I have created for my club. This is a lengthy puzzle so feel free to post partial answers.
My golden rule is that moving something that isn't glued down ...
10
votes
1answer
454 views
100 Years of GCHQ - A quick afternoon puzzle!
I'm off to the Science Museum London tomorrow, to the Exhibition celebrating 100 years of GCHQ. As such, they sent me a little reminder email this afternoon.
On the bottom of the email was the ...
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votes
1answer
148 views
Any help with this code (source text based game)
Source: Torn.com (text based rpg game)
31 30 35 20 31 32 31 20 31 30 31 20 36 38
20 37 30 20 37 31 20 35 34 20 31 31 39 20
31 31 34 20 37 34 20 37 35 20 36 35 20 31
32 32 20 31 30 36 20 35 33 20 31 ...
26
votes
2answers
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The Hidden Treasures
Credit: Brandon X.
My friend made this riddle and I think it’s pretty well made with lots of components, so here it is:
...
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0answers
99 views
What does this message in paper say? [closed]
You wake up in an old horse wagon and get a piece of paper with strange symbols. What does it say?
//Anyone can help me. Please!
31
votes
2answers
2k views
A trip to the library
I try to go to the library at least once every month, so I've developed a pretty good relationship with the librarian, a nice old man who sometimes teases me about my broad set of interests. Yesterday,...
13
votes
1answer
935 views
What a beautiful canyon!
My friend sent me an image of this beautiful canyon and asked me to work out where he is. More specifically, his latitude and longitude.
The only issue is that he's in Europe and this photo is of the ...
9
votes
2answers
618 views
What's the correct password?
A detective was working undercover to try to bust a suspected gang of criminals. He got invited to a fancy club that needs a password to get in, but the gang leader said that everyone will be given ...
5
votes
1answer
348 views
Oh go dear! again… we Here
What is the missing one?
$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, $
[Some colours look alike, sorry about that, but then again you don't really need to be able to make a visual difference between them, ...
3
votes
1answer
527 views
Secret message 01
116313333134261542156511321455121126113213151461123615112516114142
OK, so recently I made up a way of sending coded messages and I was just wondering how difficult it would be for someone to crack.
...
3
votes
1answer
180 views
I wrote you a message
Take the dogs out for Millan, but only after you find the alphas.
dog 1234 Ny nx
dog 556 fqrtxy Fzlzxy 567
dog 5819 gzy 2 nx 345
dog 13445 fqwjfid 74859 mty. 55645788
dog 1234 ...
12
votes
2answers
444 views
The Grand Grid II
Have a look at the first Grand Grid to get an idea of the basic concept
Each Grand Grid involves you discovering clues that allow you to solve a logic grid puzzle. The second in this series will be ...
