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
104 views

Find the hidden message in... this grid

(So I made this puzzle, and I wanted it to be fun rather than difficult! I hope it’s original enough) Given a 5x5 grid as input, here’s an algorithm: randomly select any 3x3 grid within the 5x5 grid ...
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My favorite holiday destination

My favorite holiday destination is hidden in this secret message. Can you find what it is? Hint 1: Hint 2:
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309 views

The Popup Annoyance

The story Fred, a software designer, woke up, got dressed, took a shower, ate breakfast, then headed off for work. He sat down on his chair and booted up his computer, only to see that all the files ...
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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
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Increment and shift the points, to the cipher!

I just thought of a cipher, here's how it goes: Input strkey intkey Output Hello World! abc 9 ƉƦƭƭưšƘưƳƭƥŢ Crack this cipher i'm happy 13 ŧʦƖ˕ƅ˄ƇˆƏˎńʃƘ˗ƌˋƍˌƗ˖ńʃƇˆƍˌƔ˓ƌˋƉˈƖ˕ POW! !@@#$^&*() 2 ...
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222 views

A very basic cipher

The following is a relatively basic cipher I have constructed. I still hope it's entertaining. _ _ _ _ _ _ _ A _ A A A A A _ A A A D B B _ A A B H The answer is ...
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279 views

Just your average cipher

I decided to attempt making a cipher, and here is what I came up with: ...
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159 views

Can you solve this sortpher?

(Sort-cipher, heh heh.) This is a follow-up to "Bees sting." = [1, 2, 3, 7, 8, 9, 5, 6, 4] If, indeed, "Bees sting." = [1, 2, 3, 7, 8, 9, 5, 6, 4], then can you reverse-engineer ...
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Confectionery Crime Conundrum

Yesterday I received one of the strangest cases of my career as an I.S. PI (Insightful Sleuths Private Investigator). I was reclining in my chair, working on the latest crossword puzzle when I ...
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A special kind of thank you

I typed up a thank you message this morning, but I accidentally ran a cipher on it and can't remember how to unscramble it. vh 5cq pajmn lujbbaxxv fjclqrwp cnaaxa dwoxum xw cqn cnunerbrxw. R anvnvkna ...
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Decipher this message for instructions to decipher this message

NINTH UNDUE COMICAL BURGER CUTLETS SLITS TURTLE REGRESS SORTS PROPHET SQUATS PUPPY ANGINA DUDS SKUNK TIGHT ODD TERSE COLONEL DIVED SOON AREA DIARIST SKUNK DREAD HASH RENTER DOWDY MAMAS GURGLE PORPOISE ...
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Encrypted string to decipher

Here’s an encrypted string which I submit to you for deciphering. I do know the answer. m"eqpI!#ttfytp"wJ"/vvq!vj"egbpd‛fo!gucwksrs"pmnufo!ujju"!wsq!"tuswhkg"...
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1answer
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What does this "ordinal cipher" say?

I invented (I think) a kind of cipher! What does this message say?: first fifthhsecondngfourth firstsecondthirdfourthfifth, fourthecoseventhd fifthsixthsecondseventheighthfourth ...
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Ernie and the Social Network

Ernie finally made it home over the weekend, so I dropped in to give him a bit of help tidying the house (the house sitters hadn't been the most dependable people). We were just finishing the ...
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1answer
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What are these two athletes talking about?

Fernando Alonso and Esteban Ocon are currently the two drivers driving for Alpine Racing Team in the 2021 Formula 1 season. Earlier today, Fernando and Esteban had this conversation in clearly coded ...
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Message in another form

The goal is simple, figure out the message hidden in the numbers! ...
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Boxentriq level 20 with dancing figures and a book cipher

The picture below is a puzzle from the Boxentriq game, which should help me find a particular book. Decoding the pictured Dancing Men cipher gives me "LIBERAL II". Using this and the numbers ...
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Everything needed to solve this cipher is on Puzzling Stack Exchange [closed]

5444 ---> lcxxfy 1906 ---> pstbqjilj 1582 ---> tcxvbpixrpejooat 1431 ---> dohhsfb 888 ---> uvqta 605 ---> noacomputers 618 ---> ylibz 425 ---> ...
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1answer
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Can you pick up an extra shift?

I was going through some old documents the other day and found some instructions for a one way cipher: Given a word w, iterate over its characters. For each character c, determine if its zero based ...
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Oh, the burning blade! Stabbing him in the heart!

It's early afternoon, and you're just arriving at the Puzzling Examination. As you walk in, the Duke personally greets you. "It's you!", he exclaims. "I was hoping of giving it in ...
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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....
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Find the hidden message in the following equation

Find the hidden message in the following equation. The answer is not in verbal format. $$| -3xmy + xy_5 |^3 = 375g^3x^3$$
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1answer
256 views

Mapping days as a 4 digit number! [closed]

I have a puzzle that includes mapping days as a 4 digit number. Sunday: 6137 Monday: 6240 Tuesday: 7358 Wednesday: 9497 Thursday: 85?? The first digit is just the number of characters and the second ...
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Odds of there being two solutions to a word puzzle [closed]

What are the odds of there being two solutions to, say, a cryptoquote? And is anyone aware of an example of such?
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Open one curtain and you see another curtain

There are two sets of ciphers in this puzzle. Open one curtain and you see another curtain.
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What is the battle?

You wake up in a strange room. No one is there, as far as you can tell. But there are three doors, a piece of paper and a numpad, which is a standard keyboard. (this is N. O. T. a 'what door should ...
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1answer
179 views

A Cryptic Book Cliche

There is a strange bookcase at the end of a chapel's corridor that is pitch black, save for a few lanterns lighting the way. As you approach the bookcase, you notice six conspicuous books with unique ...
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No Time to Die, Period

Inside MI6's server farm in the middle of the night, the operator's eyes skittered frantically over an intercepted message: The development of our new APG code has been coming along nicely; I've ...
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1answer
337 views

A rather odd tree

I was exploring an ancient garden. It seems the original inhabitants had long since left. One of the trees particularly struck me. Besides the delicious-looking red fruit the branches were twisted ...
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1answer
271 views

An airport authority's important message

A middle-aged man sat in a sofa in an air-conditioned room of an airport, staring at the officer facing him; the latter had her left hand on a small laptop. "I have a very important message for ...
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3answers
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The Jade Rabbit's present

The Jade Rabbit hopped up to Chang'e with a plain white box. "I've got a present for you!" "Another elixir of life?" the immortal moon goddess sighed. "I've lived through so ...
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The maze one should not enter

Once upon a time, somewhere in Italy, two archaeologists unearthed a buried passage. As they explore the passage they reach the doorway which is clearly the entrance of a wide structure behind. They ...
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Encrypted code with colours and letters. Can you identify the code, I have the possible key [closed]

I have a code that I can not break. It has been looked at for such a long time and I have tried to solve what might be the content or message. I recently was made aware that the alleged key for the ...
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1answer
199 views

any tools/sites/algorithms to decipher garbled text based on improper hand position on a keyboard?

Not sure if this is the proper place to ask, but I sometimes come across garbled text (see example below). My suspicion is that the garbled text is due to a person temporarily placing their hands in ...
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Which emoji is 🍔 burger's match?

Known matches: Key Matched 🤣 🤝 🙃 🙂 ❤️ ❣️ 🐸 🐷 🐍 🐌 🤔 🤎 🚀 🙏 🍓 🍒 👆 👅 🐟 🐞 😥 😤 What is my match, if I am 🍔? Hint, since I don't believe in torture
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The answer to this code is a famous celebrity

simple and fun--this is another code I made for friends Hints (how few can you use?): ...
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1answer
153 views

A series of strange codes

I made this code series for my computer science friends—they had fun solving it, and one of them told me I should put it up on this site, so here goes. The end of the code is rather unexpected! Each ...
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1answer
124 views

Room Puzzle, containing chess and ciphers. Can someone help? [duplicate]

I Have to force checkmate black king in two moves only its white turn. And the keypad Someone also asked this question here like a month ago, but the answer was wrong i tried alot of things but ...
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2answers
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A new kind of cipher

While not a wholly original idea (I stole it from somewhere–just can't remember where), it should be resistant to classic cryptanalytical techniques. However, I have my doubts about its actual, real-...
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1answer
348 views

How was this cipher created, and how can I solve similar ones?

My friend sent me this cipher: etsitsiduamuqmuessenon,tsesumissep"omaet"orpdouqmuiterpteangamecovtivamalcxete She also said it roughly decodes to: And I screamed for whatever its worth, '...
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1answer
267 views

Chess-based escape room [closed]

You go into a room, and the door closes. Some sign says: You must find a forced checkmate on the black king in two moves. The key for the Vigenere is ONLY your moves. In other words, if you played ...
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157 views

Message passed between friends in a library

Mary met her friend Jenny in the library. They gossiped about various things and then each chose a book and went to separate corners of the library and sat down to read. After half an hour Jenny went ...
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1answer
183 views

3 mysterious emails

I got this from a neighbor, but I don't know why. The emails are separated into 2-3 parts. Here are the emails: Title: RO KED BYA LAOUT Y Body: JRU. ESMY YP JSMH PIY PM YJR NRSVJ? YJSY EPI;F GIM. PJ, ...
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1answer
261 views

Cracking prices

I recently went to a furniture store where people spend my annual salary on a garish commodes and ostentatious vitrines. I note a curious code at the bottom of each item’s description label. Some ...
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1answer
158 views

What is the next diagram, and what is the number?

I needed some help to a friend of mine, he was solving a puzzle. He sent me a remake of what he was solving, and its up to you to help my friend! Note: My friend says that he messed up at 32, there ...
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1answer
104 views

Cipher with uncommon letter distribution

I have a cipher that I'm trying to decode. It's quite lengthy, so I started trying do do a simple substitution. I checked the frequency and noticed that every letter in the alphabet was used - and ...
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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 ...
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1answer
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What prank is my friend implying?

On April Fools, my friend has given me a sentence and said it's a prank, but I didn't understand it. I asked "What is this?", he mentioned "A joke.", so I was confused what he ...
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149 views

A hacker emailed someone then

A hacker sent a message in to someone that says... DARKGREEN WHITE WHITE TURQUOISE He sent another one which is... Think you can keep up with me? Enemies inbound! "Stretch out your neck!"...
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Ifz, ipx bsf zpv epjoh Wbooz? What does this code from my mother's highschool stuff say?

I found this code in my mother's box of highschool stuff when we were cleaning the basement and found this just wondering what it says Ifz, ipx bsf zpv epjoh Wbooz? J bn epjoh xfmm, zpv? J bn epjoh ...

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