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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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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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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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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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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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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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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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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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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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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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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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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What set is the odd-one out?

RCTPS MNCFON RCTPS KVWP BIBI HWQB IHQB IHQB ABAABBBB ABAAAABB ABAABBAB AABAAAAA ABAABABB ABAAABAB ABABAAAA ABABABBB AABAAAAA ABAABBAA ABAAABAA ABAAABBB ABAAABAA ABABAABB AABAAAAA ABAAABAB ABABAAAA ...
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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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Were the Decipher II and Decipher III puzzles solved, and if so when and by whom?

The Decipher jigsaw was a relatively famous puzzle released in the early 80s, promising a $100,000 dollar prize to those that could solve it. After two years with no winners, the creator, Warren ...
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The Last Challenge

This question is a continuation of this one, and you might want to read it if you haven't already. 'Another code-name,' I think. 'There's no way that's his real name'. Nonetheless, I type in '...
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MASK or no MASK

Everything you need is above..
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Try to decode this ciphertext! It's probably enciphered multiple times

As the title says: Your mission is to decode this ciphertext. Hint: It's probably enciphered multiple times. Yrj cxc myxn yfqqbs, myxn nxmb obfuuh xn dohqmxd..
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Code with algebraic symbols

So my friend asked me to look for what kind of code or cipher (or anything) this is, and I have been researching for a while now without any luck. The code: ++ ×× -- / ×= ×÷ -- -÷ / -= ×÷
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The Thief's ®341 Name

This question is continuation of this one. You might want to read that if you haven't already. 'That's it' I thought. 'B3TA_Z3R0' should be the thief's code-name. Typing that in the 4th monitor's ...
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The Puzzling Free-to-Play Escape Room, naturally!

An entry in Fortnightly Topic Challenge #50: Escape Rooms Without revealing too much, knowledge of geek culture and/or superb Google skills are required for this puzzle. Coming from an anime ...
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What is the thief's name?

This is a continuation of this question, and you might want to read it if you haven't already. I rub my eyes. A slight gap between my eyelids tells me that the Deputy-Inspector has been shaking me. ...
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The Perplhexing Mystery

There has been a jailbreak in my (imaginary) town. And I, a Junior Detective of the town, have gone to investigate this. As I reach the police station, an inspector comes out to greet me. No doubt he ...
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28 Minutes Later

An entry in Fortnightly Topic Challenge #50: Escape Rooms I open my eyes to find myself lying in a bed in a white room. Sitting up is difficult, as a tangle of wires and tubes are attached to my arms ...
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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 ...
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“Friend”-ly Puzzle

All stories in this puzzle are fictions; the puzzle was made by myself. My friend left me a puzzle. He gave me 5 papers, each had some information on it. #1 WORD SEARCH A B C D E F 1 SOR SUF HYP ...
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The Burnt Textbook

You and your team have successfully intercepted a message from the enemy, which could win you the war! But the message is encrypted with a difficult cipher, and your textbook's instructions for ...
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Why did they close my riddle?

So I came up with this -at least what I thought to be a- great riddle and posted it on this site. Within minutes, it was closed by the community. It said: This looks like a puzzle you found somewhere. ...
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Rison's Jangles

This message is from a text game and has me stumped. I do not know the correct answer. The game is from the Legends PBM System and the text is discovered within the game so it's not something I can ...
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A Code That's a Little Bit Weird

The street outside Rockefeller Center was a very busy place to hide a secret message, I thought, but sometimes the best place to hide something was in plain sight. I'm a government agent, from one of ...
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Slitherlink with a message

An entry in Fortnightly Topic Challenge #48: Unusual tag mix After pondering what my next puzzle would be about I decided to change my base towards the realm of slitherlink puzzles. I found this ...
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Earth Science | Chemistry + Flags

An entry in Fortnightly Topic Challenge #48: Unusual tag mix Which famous chemist is represented by these flags? Go big or go home!
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Cryptic Geometry

An entry in Fortnightly Topic Challenge #48: Unusual tag mix I was trying to study some geometry, but I just can't seem to wrap my head around all this mathematical mumbo jumbo. Can you help me out? ...
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In the Cover of Darkness

I awoke in a mysterious desert wasteland that I didn't recognize. I looked around and saw nothing as far as I could see, except for the oddly rhythmic storm in the distance. Reaching for my phone, I ...
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Not the Genesis of a Break

The following cryptic clues are in English, don't include punctuation, and have a theme (except for one minor exception) which will provide context for the definitions of the clue. There are two main ...
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The Vanished Violinist

The inspector sighed as she lifted her head from the mess of notes, scribbles and diagrams on the desk. The air in the office was so thick she could barely make up the "no smoking" sign ...
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A Short Readable Note

Back in high school when I was in a math class, I came up with a brief note that I didn't end up sending. Can you tell what it says? !r!k6ⲗonrncⲗ There is no ...
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A strange Letter

1: Hey, could you please give me your car tomorrow? I have to go to the movie. 2: No, I don't think so. 1: Hey c'mon. You're my brother. You must help me. You ain't using it anyway. 2: Of course, I am ...
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U cant s0lv th!s haha - who am I?

I got a cryptic (or maybe just junk) message in my inbox today: ...
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Have you this knowledge?

This is special puzzle, with no story. It should be very easy for people who know what is this: GgcuuUcaGuUgUauAuuUguUaa The target is to find the word from that string. And, if you really want to ...
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Looking foward to the Message

Some words of wisdom from a good friend of mine. He sent it to me in a form of a puzzle for me to work out: 1) Integral - killer's initials and victims end (3) 2) Stiff, dull-spoken. (5) 3) Sheep ...
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Ohh, NSA Again?

So I decided to write this puzzle with a story, something like that, hope you like it. Happy puzzling! Here is a story: The undercover agent John had infiltrated a terrorist cell. They were planning ...
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Graylocke's Rotting Marble Box

So Graylocke Inc. (the previously hidden competitor to Retudin's Mazes Inc. mentioned here) has produced a new product just in time for the holiday season. We present to you Graylocke's Rotting ...
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Cryptogram with one frequent letter and other letters random

I arrived at this ciphertext as a result of a particular decryption step from the famous unsolved "Kryptos 4" cipher. It has a very unusual letter distribution: ?...
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Captain Clumsy's crummy communication

An entry in Fortnightly Topic Challenge #45: Flags Captain Clumsy never ceases to amaze me... This morning I was down at the dockside when I heard a shout from a nearby ship. Steeling myself, I ...
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Communication via a Rubik's cube

So, I watched The Promised Neverland recently and after exploring a little, I found out that Norman used a 5x5x5 Rubik's cube (aka a professor's cube) to communicate when he was held at the $\Lambda\...
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Did you go inside, or…?

The following underscores represent the letters in a sentence. There are extra spaces between some, indicating a word delimiter. Punctuation is included in the sentence. ...
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Density™ 4… Will there be more?

The original puzzle contained a mistake, this has now been fixed. I'm really sorry about that! Last Density™ puzzle is here: Density™ 3 - The Game!, will there be more Density™ puzzles in future? This ...
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Who murdered His Majesty the King?

Furious, the chief officer of London's police force stood in the foyer of the late Majesty's mansion, trying to compose himself. Sitting before him were the three suspects, Toby and Ned (whom he'd ...
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Density™ 3 - The Game!

The last Density™ puzzle (here: Density™ finally back from holiday!) proved that OP plays too many games, so we went ahead and created a game of our own! If you'd like to create your own Density™ ...

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