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.

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1answer
271 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 ...
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My Friend in Kanto

I have a friend in Kanto. He sent me a message and told me that he's looking for all sorts of creatures. Included was the following list of descriptions. I know there's a message hidden in there ...
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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 ...
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2answers
239 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 ...
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406 views

The Librarian's Labyrinth - Part III

"This Library is HUGE!," You say aloud. You hear your voice echoing through the halls and nothing else. How could this be? Who comes here? You start examining the books on the shelves. It's just your ...
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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 ...
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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 ...
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%#@& : $!*^ :: SOFT : 5697 :: 8924 :?

If %#@& is coded as $!*^ and SOFT is coded as 5697. ...
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1answer
221 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 ...
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1answer
302 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: ...
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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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1answer
264 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 ...
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652 views

What is going on? Paintings too?

Part 1: 2 and a half months ago, an old mansion, people are falling sick for no apparent reason. You, a PI, have been dispatched to go and figure out what is happening. It's a snowy day in the middle ...
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466 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 ...
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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 ...
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1answer
118 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 ...
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204 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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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 ...
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1answer
127 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....
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1answer
150 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 ...
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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 ...
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A journey through letters and numbers

In the year 2407476658354979366708415043923125501315337890943021769230219230892355006879909214795402102204224, as cosmopolitanism is in the air and companies are more than ever bound to ...
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BFTIODFTTWKBCSC

This is my first self-developed cryptographic puzzle. I hope it is neither too hard nor too easy for you to break, and that you enjoy it. Please do not only post the answer, but also your way towards ...
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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....
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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. ...
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code the following word using the sample code logic

Sample apple = btqreqemf mango = ntbreoehp banana = ctbreoebob code: orange = ?
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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,...
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Knowledge is key. Skill is not

First let me tell you this. The first is easy, then it MIGHT get harder - depending on knowledge. This is all knowledge and no skill - take that as key. I like to call this one the "Stage Cipher" ...
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1answer
359 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, ...
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2answers
662 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 ...
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1answer
168 views

What's the answer to this?

I've been sent this yesterday with no info and I'm so confused. Can anyone tell me what the message is? Seh gdyla wdhjh, seh qhun alts bhn hqhunxyh plt axxbdyf gxu plt yhqhu gxryi lyi tx seh wrmmah ...
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265 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 ...
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448 views

Hiker's Cabin Mystery | Pt. III

See Part I | See Part II | See Part IV Finally, you've gained access to his files... but the filenames are all encrypted! Oh, no! You only have one chance to open the files! Which one should you ...
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1answer
475 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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One 'double agent' two-step on a waltzing floor

I'm in a jam – cornered I am! – No clue 'bout where to go Here's what went down, a pretty gown Some wine, a French chateau She whispered underneath her breath "Come dance with me and ...
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1answer
153 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 ...
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856 views

A Puzzling Cipher: Redux

A couple months ago, I posted this, to test a new cipher encryption idea, but it was poorly constructed and did not work. After that puzzle fail, I redesigned it to work better, making it much cleaner,...
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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!
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1answer
952 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 ...
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1answer
450 views

Word Search Cipher

I have come up with a cipher idea that probably isn't original but I can't find anywhere, and I wanted to get an idea of just how hard it is by seeing if anyone here can crack it. I would especially ...
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1answer
360 views

Underworld Royalties

1. Mr. Edison's Travel Diaries From Liverpool, James Edison traveled to Valencia. After watching the scheduled match, he then traveled to Italia and then Amsterdam where he promised to return in the ...
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1answer
544 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. ...
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1answer
192 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 Xyfd 5678 kwtxyd! ...
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1answer
352 views

The Grand Grid I

This is the first in a series I am calling The Grand Grid. Each involves a logic grid puzzle that is solved by gathering clues presented in variously obscured forms. The description of the grid puzzle ...
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2answers
268 views

Luncheon in the dungeon

– "Sssslither..." Brigitte jumped. The voice had whispered almost directly into her ear, yet there was nobody to be seen. She looked at the ground beneath her feet. Was something moving? She ...
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4answers
320 views

Defuse… It's going to blast!

You are an intelligent decoder. The FBI now needs your help to defuse a bomb. You move near it and find the following notes. You have a glance at the notes. You are now ready to decode and defuse.. ...
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1answer
190 views

Rubio, please help Clark!

Clark who is consecutive in nature, lives in California near the 100th street. Today he decided to take his palindromic boat and visit France. He booked a room which has a number of thrice a prime. ...
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171 views

A cryptic list of words

You find yourself trapped in a dark room. You say, "hello" and bright lights turn on, flooding the area. You see a piece of paper on the ground: ...
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1answer
135 views

A little bit of encryption

A little selfmade encryption riddle: Whenever I'm searching for a solution, I have this feeling, like standing on a single point. While I take a step forward, I have the feeling I'm falling two ...
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1answer
325 views

A periodic message

I was wandering around Washington, D.C., recently, not paying attention to where I was, thinking about codes and ciphers, when suddenly it hit me. No, really: a blast of wind blew a paper right into ...

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