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Questions tagged [cipher]

A cipher is a simple method of modifying messages to make them unreadable except to readers who know the key. Common ciphers are Caesar, Vigenere, Atbash, and several types of substitution cipher. Other ciphers include polygraphic ciphers such as Playfair and Foursquare and numerical ciphers such as Polybius and Nihilist. Cipher puzzles sometimes make use of data encodings like Morse, Binary, or Base64.

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Noita Eye Glyphs

A puzzle found hidden between the background layers of the computer game Noita. The puzzle has not been solved since it was added to the game in October of 2020. It is made of thousands of eye images, ...
codewarrior0's user avatar
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25 votes
0 answers
2k views

Decrypting the Key: "Phage is Spreading.."

I've been trying to solve this puzzle called "Phage is Spreading.." ...
Coto TheArcher's user avatar
18 votes
0 answers
695 views

Determining the meaning of a challenge coin

I saw this rather cool looking challenge coin the other day, and I was wondering what the associated binary on the back of it means, as it isn't standard ASCII. In plaintext: ...
DeepS1X's user avatar
  • 281
14 votes
0 answers
2k 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 ...
user avatar
14 votes
0 answers
799 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?
OnlyF's user avatar
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14 votes
0 answers
1k views

How would this binary-ish code be translated?

...
RobustPhysics's user avatar
12 votes
0 answers
645 views

Meteor strikes again

Part of a phone call: -...well why didn't you just say so? -It wasn't as easy as you thought, Jack. All the power lines here were destro--- -I know...It's not like we're living on a different planet ...
Zero Pancakes's user avatar
11 votes
0 answers
338 views

Can you find the cipher that I used?

I have encoded a phrase, using a cipher that I invented. But I don't want you to decode it, rather I want you to figure out how my cipher works. This is the phrase that I encrypted Find the ...
H Franklin's user avatar
10 votes
0 answers
687 views

A funny looking cipher puzzle

What secrets does this jester hold? Hints are found down the road. A hint, or rather, that what is held transcribed:
Mark Marketing's user avatar
9 votes
0 answers
682 views

Signatures of serial killer Edward Wayne Edwards?

This is from a real-life murder-mystery. In 2009 Edward Wayne Edwards was arrested and convicted of five murders, following a tip-off from his daughter April. Former detective John A. Cameron ...
George Barwood's user avatar
9 votes
0 answers
289 views

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 ...
Omicron Zed's user avatar
9 votes
0 answers
481 views

What causes these signs to follow this relation?

Can you find why does the below relation hold true? Hint 1 Hint 2
19aksh's user avatar
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8 votes
0 answers
448 views

Cookie Unionization

My Christmas cookies are gone! When I came into the kitchen this morning, the box was empty. All that remained were a few crumbs and this note: We absconded. You never saw that coming, did you? Well, ...
Lyra's user avatar
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8 votes
0 answers
418 views

An Evil Cartesian Psycho

I came up with this puzzle when I was in high school. There is an island owned by an evil man who keeps some tourists who were visiting the island a few years ago captive. The authorities demanded ...
Pspl's user avatar
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8 votes
0 answers
527 views

Impossible Cipher v1.0

When I create riddles, ciphers etc.. they seem to get solved within only a couple of days of writing. Well no more! This cipher may not be impossible but is extremely difficult. If left unsolved for ...
William Pennanti's user avatar
8 votes
0 answers
670 views

How to Complete this Cryptographic Challenge?

This question is from a CTF that a company (EY Cybersecurity) did almost a year ago. The original website is no longer available. ...
2shy2sayHi's user avatar
7 votes
0 answers
484 views

A multi-symptom affliction

"Kindly state your name." The nurse's voice was polite, but qiet. "I'm sorry, I can't hear you, my hearing's bad." Being mostly deaf was quite frustrating for our patient. "...
mkinson's user avatar
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7 votes
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14k 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 ...
Kritzeh's user avatar
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6 votes
0 answers
475 views

Find the secret 7-letter message embedded within this message (unsolved)

Background This puzzle was originally from a puzzle contest for the USC Viterbi Magazine that is now over, but the answers have not been posted. My friends and I have been working on it for weeks, but ...
Kyle He's user avatar
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6 votes
0 answers
236 views

Number Code - A Visitor by Moonlight

You hear a knock on the door downstairs while you're sleeping. You creep down the stairs by the light of your phone, only to see a shadow exiting through the window. By the moonlight, you see a piece ...
RK01's user avatar
  • 161
6 votes
0 answers
518 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 ...
Omicron Zed's user avatar
6 votes
0 answers
723 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 ...
Fusseldieb's user avatar
6 votes
0 answers
327 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 ...
Kit-Ginevra's user avatar
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6 votes
1 answer
497 views

Late 18th/early 19th century numbers grid

I was researching an historical figure on the Isle of Man, Capt George Quayle (b.1751 - d.1835), and in amongst the museum's papers was this numbers grid which was part of his effects. The museum ...
Breebeg's user avatar
  • 61
6 votes
0 answers
859 views

Need help with a cipher: "poems" with capital letters

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 ...
Stephanie's user avatar
5 votes
0 answers
355 views

Decode the ancient prophecy

A team of archaeologists has discovered an ancient clay tablet. They understand the script it is written in, and have transliterated it to the Latin alphabet, but they do not understand the language. ...
Someone's user avatar
  • 283
5 votes
1 answer
398 views

Hidden composer

Today I wanted to make a "logo" for a composer. I liked logos with deeper meaning so I had gone ahead and tried this design: What composer was I trying to make a logo for?
poco's user avatar
  • 2,158
4 votes
0 answers
326 views

Lucas's interesting cipher

Lucas was fooling around with some letters when he encoded some text into Gsobj lwmtkd sbceugb vfy rgdjb.. Can you figure out the original text he had?
Alan Bagel's user avatar
4 votes
0 answers
374 views

Cryptogram or Anagram

ArenETalagooD fanemiPhOdl Clues: The answer is 7 characters Answer can include the following characters: a-z, ...
nomad.lw's user avatar
  • 139
4 votes
0 answers
337 views

Relax, I’m Kidnapped! - Part 2

Part 1: Relax, I’m Kidnapped! - Part 1 You manage to solve the crossword, and you show your captor the answers. “Well, you solved it…but I’m not done yet. Go to my room,” he replies. He directs you to ...
misc544's user avatar
  • 369
4 votes
0 answers
502 views

To get the answer, you'll have to get the key first

Below there is a cipher hidden in the text. Read everything very carefully. As far as I know, it will give the necessary hint. Look for some patterns: Let nobody distract you. Eventually, you will see ...
Lezzup's user avatar
  • 6,771
4 votes
0 answers
241 views

Hexadecimal string on a US Military challenge coin

I have been given a string which I believe to be in hexadecimal. The string comes from the edge of a US Military challenge coin (non-sensitive information). A photo of the coin: ...
Ed Boykin's user avatar
  • 141
4 votes
0 answers
194 views

Need help with cipher

I've been attempting to solve a coded message that someone posted to Twitter, but I can't crack it. I'm not even sure what kind of cipher it is. I believe it needs a key to be solved, but I'm not sure ...
Piers's user avatar
  • 41
4 votes
0 answers
413 views

My first meta puzzle (as I remember)

I don't have any comments about this question, all info are in the image. Hint 1:
IsaacRoan Sison's user avatar
4 votes
0 answers
361 views

The Official Stack Exchange Spelling Bee, sponsored by *something something*

Behold, the First annual official amaaaaaaaaaaaaaaaaaazing Puzzling Stack Exchange Spelling Bee! With hard words! Harder puzzles! And conveniently pre-signed-upped competitors!!! insert canned ...
user avatar
4 votes
0 answers
623 views

Running away from a 5 euro fine

Scenario: It is 10:50pm You are in France running away from you 5 euro fine in Germany. You finish paying your 13 euro bill at the coffee shop. Then when you check your inbox at 11:59pm our lawyer ...
Varun W.'s user avatar
  • 1,323
4 votes
0 answers
298 views

The obscure message

I created this puzzle. Find the message. q螣 s䈚 q蟝 v쀎 q蟾 q蠸 q襪 q褰 q弧 q螣 q襪 q蛡 q袈 q蟝 Hint 1: Hint 2:
Suzuna Minami's user avatar
4 votes
0 answers
278 views

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

If %#@& is coded as $!*^ and SOFT is coded as 5697. ...
Chandrashekar SK - CSK's user avatar
4 votes
0 answers
326 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 ...
Joshua Bizley's user avatar
4 votes
0 answers
284 views

What are these encrypted Starfield tweets saying?

There are a lot of rumors about Bethesda Softworks and/or Bethesda Game Studios announcing a new game at E3 this year, or even on May 14th (source). A key in this mystery is the trademark 'Starfield'. ...
World Outsider's user avatar
4 votes
0 answers
268 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 ...
Anonymas's user avatar
4 votes
0 answers
458 views

Encrypted message with Fs, 5s, and 6s

I've been redirected here from Cryptography SE. This is a university assignment. We are supposed to be employees in a corporate environment that has managed to steal an encrypted message from another ...
ITguest88's user avatar
4 votes
0 answers
542 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. ...
Kevin's user avatar
  • 141
4 votes
0 answers
289 views

The Search for Dracula - a puzzle

Some friends and I are playing a roleplaying game 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 ...
Funzleshpons's user avatar
3 votes
0 answers
181 views

What did Aryabhatta say?

I was looking at an old Sanskrit shloka. I saw the following verse - and as I know Sanskrit (or Saṁśkrutaṁ), I translated it roughly. tukā nātha kabīra ete ādikavayah | nāmā gadimā kintu ...
Harikrishnan M's user avatar
3 votes
0 answers
153 views

The Mono-Quantum Condrum

You are presented with a locked box, and on its surface, you notice a sequence of peculiar symbols: ⌬ ⌅ ⊙ ⊡ Next to the symbols, there's an inscription: ...
Aitzaz Imtiaz's user avatar
3 votes
0 answers
164 views

encode in encode

Today, a cryptic message was received by Area 51: Bananatexteismarvellous605185682252125223459314283216133301 2 The staff managed to figure out that some 2 digit ...
BETABOT's user avatar
  • 31
3 votes
0 answers
267 views

Please, I don't know greek!

data key result 7, 2, 17, 82, 56 0 ΛΞλν 1, 3, 8, 127, 65, 8 19 εΤψΒΖ 5, 64, 13, 9, 4, 42 7 δδιΡΠ 13, 9, 8, 657, 31, 3, 7, 5 3 ? Hints
Alan Bagel's user avatar
3 votes
0 answers
407 views

A splash of Minecraft?

I was playing Minecraft the other day and came across a beautiful splash message. Subsequently, I was inspired to create a puzzle for it. Svir, look out below! Shorty's slang stays surprisingly stout....
Hazel へいぜる's user avatar
3 votes
0 answers
242 views

Code found written in chalk: "JSMYCTLYCTJCBEXD19"

The code I found on the sidewalk in chalk at my local courthouse is JSMYCTLYCTJCBEXD19 I have had trouble identifying the code type as well as the deciphered message. Any and all suggestions/help ...
user74206's user avatar