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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145 views

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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182 views

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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355 views

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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345 views

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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680 views

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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Expanding on a classic

From the simple caesar to the seemingly uncrackable elliptic curve, there are countless ways to obscure - and even hide - a sensitive message. Cryptography is quite interesting in this way. I find the ...
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What's my favorite number?

What is my favorite number? You need to find my favorite number from the clues shown below and the hints. I am in cars, but not in buses. I have two in cucumbers, and two in clicks. I am in ...
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113 views

Negative Meta Post

Behold, the first (predictably negatively scored) meta post on the main site. To puzzle posters of this site: 123##456 sacrifices 123#456. If you're going to focus on 123##456 over 123#456, you ...
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Decrypting an image-based cipher I found online

My buddy shared an image with me that has the following characters (above which are written interpretations my friend came up with). I have no idea what it says, but we're interested in finding out (...
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Anarchists corrupted my barcode!

Somebody corrupted my QR Code. Can you tell me who did this and when it happened? Hint:
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249 views

What type of puzzles do I like?

Zeur Tdconprziies Stevia rebaudiana (17) Predictable (4) Kirby (6) Tetromino minesweeper (3) And a mixture of: fort to is "Word Hint: Hint 2:
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mmm mmmmmmmmm mmmmmmmmmmmmmmmm mmmmmmmm mmmmm mmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmm mmmmmmmmm mmmmmmmmmmmmmmmmmmmmmmmmmm

mmmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmm mmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmmm mmmmm mmmmmmmmmmmmmmmmmmmm mmmmmmmm mmmmmmmmm mmmmmmmmmmmmmmmmmmm mmm mmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmmmmmm ...
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Help With Dan Brown's Unsolved Puzzle

Dan Brown has an unsolved message on his website https://danbrown.com/ There are hidden symbols on 5 JPG images and 5 PNG images that overlay the JPGs. JPG Images: int1.bg.jpg, int2.bg.jpg, int3.bg....
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Open the curtains

Open the curtains to reveal some words of wisdom: ...
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What's up with these words, eh?

hello there = llehht oere Voldemort's Wrath = dloVrome s'ttarWh This is weird, right? = sihT si riewr ,dthgi? Just figure out what is happening to these words. = tsuJgif eru tuotahw si ppahnineot ...
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Decipher the language

An alien planet called EMJ-26 has an alphabet that has letters switched around. Their language is identical to english but they use different letters. Here are the names of some countries on earth ...
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Wait a minute…Where did he go? (part 1)

A secret person hid three rolls of paper under my bed First roll: you'll find my country only if you solve this puzzle '3rd of 2, 1st of 2, 2nd of 6, 3rd of 2, 1st of 3, 3rd of 2' Second roll: you'...
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The physicist's puzzle

An unknown physic1st left behind this puzzle with his belongin9s and he can no longer Be found. Here is the puzzle he left with u5 before disappEaring. Can you figure who this mysterious physicist was ...
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272 views

The Case of the Poisoned Poet

I was in my office, trying to officiate a disagreement between Misters Jack Daniels and Jim Beam, when the dame walked in. She wore a slinky dress and glasses so dark all I could see in them was the ...
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316 views

It's your turn now!

What is the simple rule behind these three relations below? $F$ $\rightarrow$ $C$ :: $R$ $\rightarrow$ $I$ $\rightarrow$ $\sqrt{F}$ :: $IA$ $\rightarrow$ $D$
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Where does my friend live? 5

Other questions in this series can be found here. One of my friends, Com, has sent me a code to show where he lives: ARIA, ---, ---, ESIA, ---, KAAN, KYAN, LAIA, ---, MOVA, RUIA, TAAN, TUAN, UKNE, --...
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What are these holes in my Connect Wall?

An entry in Fortnightly Topic Challenge #42: Wordless Connecting Walls "Why on earth are there blank spaces in your connect wall?" "In my defense, you just asked me to make categories ...
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207 views

The Painted Barcode

Someone spilled paint on what looks to be some sort of barcode, although I am not entirely sure that's what it is. Can you figure out what the original message may have been? Hint 1 Hint 2 Hint 3
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A (cipher?) puzzle in a YouTube video description

So, by chance I stumbled upon this video: MASTER BOOT RECORD - C:\DEFRAG that contains the following puzzle in the video description: 066 097 099 107 119 097 114 100 032 097 110 100 032 102 111 114 ...
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Simple letter subs with a twist!

Here's your typical letter substitution puzzle that you can solve, no tricks. But even so, there's a twist! Decipher this and find out the hidden message! xhtm tm ytxeanyyq nofxhea wdccye mf jerfje ...
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Try to decipher this puzzle; It's cipher is historical

A individual known for Polygraphiae... Gpqg atxr bqocq, ucl tzv rip gkmv iu ydw ynpa nkdk? Gvxi jamy dj przcl Gagmguon sd droabp, jxughv rge cgvx! Luvl fycw! If too hard, ask for a clue and you will ...
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113 views

Rune Ciphertext (Presumably multi-enciphered )

Here is a cryptogram: Note: this is not, very very hard. But still, it is not very very easy, I would want to say with a few clues it's more easy than hard: Clues: It can be simple substitution. It ...
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Crypted Gobbledygook, Decrypted Obvious

When it is crypted, it is gobbledygook, when it is decrypted everyone who reads it here understands! zorrqpxj gzu fuebmtvbkexjt gzu baq Happing decoding :)
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Masyu puzzle with secret code

What secret code is hidden in this masyu puzzle? Note: The regions marked with x are not to be drawn
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206 views

Who fulfills the logic?

Imagine you are on a spaceship. To activate this machine, you have to enter a code with these given clues. 1110C1742 0110F1230 1001B1126 -------------- You have to enter the fourth code using one of ...
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Pigpen cipher makes no sense

My father in law made a pig pen cipher. Gave me a coding matrix and I know the message is spelled backwards but I still can’t figure it out. Can someone help?
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A Word + Number Puzzle

This is a code: 27 15 68 28 29 16 said that '53 95 62 18 65 92 22 19 7 8 74 102 90 49.' What is the secret behind?
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Tubariphobia - The fear of pickles

There are many topics that polarize. But not a single topic comes close to the one and only age-old question that some claim is the root of all division between people: "Are pickles disgusting or ...
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312 views

Kaboom-y numbers!

Here is a new type of puzzle poem I made. Enjoy! Note: The title is named like that for a reason. I have a number in mind, it is super cool, But there's something you need to know, or you will find ...
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An eye for style

My colour-blind friend and I play in the same Dungeons and Dragons campaign. Our party had just died in a horrendously managed battle against a dracolisk (seriously, don't ask!) and so we were back to ...
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555 views

Following Rotting Links

Here's some examples of rotting links. Why are they rotting, and what links them? Lebanon - ROT -> Slovenia Monaco - ROT -> Slovenia European Union - ROT -> Slovenia - ROT -> Antarctica ...
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There is a poem hidden in this puzzle. Can you solve it?

Гӓд ӓв aӱӑ фɑҙӑз, нӑӱн ӓв ӑӱлд, Лӧд ӑӱвӑр aӱӑ фɑфләң хйuмӑн рёс, Бӥнiҫ хuз iтɜнл лӧ в̈i хӑӱлд ...
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A bird-brained cipher

Today my partner, an avid ornithologist who I swear spends his whole day looking at codes and tables online, left me this cryptic clue when I asked where he had been all day. He complained about a ...
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Can you help to secure the sky?

You sit in an airplane high up in the sky, happy to be able to travel again. All of the sudden the man next to you dies. Don't panic! You see pen and paper on the tiny desk in front of him. There is a ...

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