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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The Beale Papers

The background to this one's given here. NB: These may not be a genuine cryptograms (current thinking is that these are gibberish); but I though it interesting to share these in case they're genuine /...
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1k views

Deus Ex crypto puzzle

There is an encrypted email in the recent Deus Ex: Mankind Divided game: From the game files, this appears to be the string: ...
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842 views

Never Completed Game - Difficult Riddle

The seventeenth of the primes. Its twin is twentynine. Po. Let’s drive. Bye, Alfonsín. Add seven triangular. Sweet. It named the Valley. This riddle is taken from https://www.nevercompletedgame....
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1answer
489 views
+50

Shots, shots, shots, shots!

Once in a while I go out for a drink to my favourite bar. Normally is just drink a beer, eat some snacks and have a good time with my three friends. But last night I wanted to do some shots. The ...
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734 views

An enrypted clue for the police

A well known German drug dealer contacted his accomplice through 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 ...
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1k views

How would this binary-ish code be translated?

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343 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: ...
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932 views

Crack the pigeon code

Can you crack this message? It was discovered in a chimney in 2012 attached to a carrier pigeon and was most likely sent during the D-day invasions. The GCHQ was not able to crack it, even after ...
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405 views

Grandma's keynote

Found this note which is addressed To my grandma, in her chest Since she's passed now, here's my quest.. What tickled her interest? And who invited her as guest?
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249 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 ...
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1answer
358 views

Riddle Number Four

Time for a more challenging encryption, seeing how riddle #3 was decrypted so easily. First, I must note that this encryption was inspired during a chess match I partook in. I call it the ENIGMA ...
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413 views

Zed's Phone: Failure to Communicate

My friend Beto and I constantly buy things for one another. One day, he gave me a strange-looking phone and said it was my birthday gift (My birthday wouldn't be until 3 more months). He said he ...
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317 views

What causes these signs to follow this relation?

Can you find why does the below relation hold true? Hint 1 Hint 2
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282 views

Finding Rogue Kitty II

Having been met by a group of very unhappy bosses at Kitty is being 'returned' to the staff car when suddenly there is a commotion and she makes a run for it. As they chase her, little old ladies ...
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221 views

Encoded Dreams Cipher

This note was found at the scene of a Parisian artists loft in the 1960's. Sadly, he committed suicide the day before his first major exhibition. Can anyone decrypt his final written words? (It is ...
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11k views

Crypto Riddle for a bonus track

here is a crypto riddle a artist named Master Boot Record put on the page of his music. 087 104 101 110 032 116 104 101 032 077 111 111 110 032 119 105 108 108 032 115 104 101 100 032 110 111 032 108 ...
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Zed's Order: Breakfast at Elon's

My friend Elon and I constantly irritate each other. He recently built himself a rather respectable restaurant – a sort of bed-&-breakfast, minus the beds. Last week, he asked if I could ...
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476 views

Coloured dot cipher

I, as a curious being, stumbled upon a page which had a hidden dot cipher in it. Part of the console states: [...] we left you a little message in the dots of the footer (Source: segment.com) The ...
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308 views

The Congratulating Cryptogram

A sequel to "The Kind Cryptogram". This one is actually pretty hard, so I can give hints upon requests. (thanks to puzzledPig for the suggestion!) There are 4 "layers" to solve. In your ...
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598 views

Need help with a cipher

I am trying to figure out a cipher I think I found in a book from 1982 and it's a 36 year old mystery we are trying to solve (I will reveal the book if this turns out to be something so everyone can ...
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108 views

A possible 5-bit binary code

This image and puzzle comes from Level 18 of a game called Boxentriq. I have solved the preliminary mastermind puzzles on this level to reveal the sequence of pawns and bishops shown here, which, ...
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367 views

Zed's E-mail: My Good Ol' Uncle Sugar

My friend Gabby and I constantly look out for each other. Just the other day, she received a strange message from what I thought was an uncle of hers. "Problem is," she started with a worried look, "I ...
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115 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, ...
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198 views

%#@& : $!*^ :: SOFT : 5697 :: 8924 :?

If %#@& is coded as $!*^ and SOFT is coded as 5697. ...
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230 views

Can anyone decipher this?

My friend just sent me this 5627 4654554 With a keyword of 'Digital' Which is apparently going to make this have some sense: At first, it's difficult to understand. But once you read down, you ...
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221 views

The search for dracula - a puzzle

Me and some friends are playing a roleplay about Dracula in the modern age. Last night, we received the following puzzle from the game-master. (7 1 1 1 1) (17 8 8 8 8) (4313 2755) With the ...
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178 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 ...
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Cipher my friend sent me

"The world is: ::: :#: : ::## :### / :##: ##: #:::" My friend sent me it and said the use of the symbols : and # don't matter. It's the pattern that matters. The hints he sent were: (EDIT) I worked ...
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332 views

How to solve this puzzle?

I have solved the sudoku. Scratching my head on the second part. Any hints? It is not picked from any competition. One of my office colleagues usually post these types of puzzles on emails for fun ...
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348 views

Encrypted message (unknown algorithm or plaintext)

I've been redirected here for more, or rather more accurate help from the crypto section of stackexchange. Long story short, we have this assignment that is bugging me. We are supposed to be ...
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419 views

Binary puzzle in World of Warcraft

I apologize if this isn't appropriate here, but it's been driving me insane. Essentially, a puzzle was recently introduced in the video game World of Warcraft, which no one has been able to solve. ...
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816 views

A deciphering riddle

Recently in class a computer science related deciphering riddle was shown which I could not solve. For the course itself it is not obligatory to solve it but I am interested in the topic and I wonder ...
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1answer
204 views

Something I loved the most

Below are some puzzles you need to solve to make a 4 letter word. 1. 105 35 315 ? 2. I am the most important element in your surrounding. I was found by a Scottish physician. Who am I? 3. I am ...
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128 views

Encrypted growing sequence

The following sequence has been encrypted: 1-0 3-0 6-1 ...
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106 views

An American Friend Cipher

An American friend of yours, JL for short, sent you the following message: "I can only say that 22. 21. 24. 21. 9. 3. 6. 9. 27. 2. 23." The hint says the key may be in the initial part of this ...
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520 views

Decode this message to stop the destruction of Science!

An extremist religious organization called "The Redeemed Against Scientific Usurpation of God's Authority", or RASUGA, have converted the world's leading time travel researcher to their beliefs. Using ...
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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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419 views

Find the celestial body

Last week, a group of 5 astronauts went on a space-tour. They accidentally got crashed on a celestial body in space. Luckily no one was harmed! They were amazed to see some highly intelligent aliens ...
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207 views

Can you solve this? Cipher I found

Here is the cipher you need to solve, it is an actual English text: ...
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233 views

Definitely not suspicious

This unsuspicious ... post - has just a bunch of random letters. No secret words, no silly ciphers, nothing. Nothing to see here. Goodbye. Urgent secret message: Go to another question ahem, what ...
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331 views

Solitaire cipher riddle

I am trying to solve this problem but with no clue of what it actually means. Only thing i know is that it is solitaire cipher hidden message/key. Here is the content of the image: To: root@...
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309 views

Cipher Puzzle posed to me by my friend

My friend recently sent me some puzzle, and it has me stumped. I'm not that good (garbage, actually) at cipher puzzles, so was hoping if anyone could help me out with it. It is.. "General O has ...
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What are sequences of letters/symbols for creating a cipher?

I have two gears with different numbers of teeth (20 and 10): The small gear makes two turnovers, while the large gear makes one turnover only. My idea is to use a large gear as an alphabet wheel (...
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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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202 views

Find the PSE user name

Hidden in the ciphertext below is a user name from puzzling.stack.exchange. Who is it? The intended answer uses all of the ciphertext, not just a snippet that happens to match somebody in some way. <...
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Stuck trying to figure out a hidden message

As part of an ongoing "treasure hunt" in an online game that I take part in, there have been several forum posts made in an attempt to hint the participants to finding certain locations. However, ...
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Decoding ciphertext with base64 yields obscure unicode

Context: I was given a piece of encrypted string to decipher and I have been stuck at it for a while. To not ruin the point of the problem, I will provide only some description of the text and my ...
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255 views

What's this message? It should be in italian

I received a challenge, deciphering "cgo feco a atm", the result, if a sentence, should be in Italian. I've tried the ceasar cipher without success, maybe you can help? Thanks!
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What is this e mail really saying

Veteran investigator Ken Smith had been following a suspicious e mail trail between John Jones and Robert Brooks.This particular one caught his attention. He was trying to figure it out. From: Jjones@...