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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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15 votes
1 answer
584 views

Mapping Jack's Chicken

Clues: Map of world with numbers 1, 2, 2, 3, 3, 5, and 9 strategically placed. Portrait of man with numbers 1x2, 2, 3, 5, and 5 strategically placed in hair. Instructions: Name That Film _ _ _ _ E _ _ ...
-4 votes
1 answer
3k views

What type of code is this?

Xijtqfs, eje zpv hfu ju? Zft Cptt. If epfto'u lopx ju't hpof. Hppe, Xibu bcpvu Kbnft boe Iboobi? Kbnft jt bmsjhiu, uibu ofx Tibqf-Tijgujfs Qspupuzqf jt hsfbu. Iboobi jt opx cfjoh dpmmfdufe. Hppe, uibu'...
78 votes
1 answer
20k views

Unsolved Mysteries: Kryptos

This is the second in a series of Unsolved Mysteries posts. These posts explore current unsolved real-world puzzles. Since these have been unsolved for years, it's uncertain whether anyone on on ...
-1 votes
0 answers
197 views

Block of characters with no spaces

The puzzle is this string of text: ...
14 votes
1 answer
1k views

Solve an alien message

The following is a puzzle that I was given back in the early 1970’s. Everything that follows this introductory paragraph is part of the puzzle I was given. That includes all of the paragraphs below ...
14 votes
0 answers
803 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?
-10 votes
2 answers
888 views

Code Uncrackable! 0005200056 0005200057

You can't crack it. There's a solution, definitely. It's pretty long. 0005200056 0005200057 0005200056 0005200057 0005200056 0005200057 0005200056 0005200056 0005200056 0005200057 0005200056 ...
18 votes
0 answers
696 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: ...
14 votes
1 answer
936 views

Poring Over the Numbers: A Hidden Message

I thank my lucky stars I'm able to write this to you. I spent a hefty percentage of my remaining cash at the courier's office and I want to underscore the importance of this communique. If a man comes ...
5 votes
2 answers
727 views

Code breaking: Find the Message in string of numbers 24141325121914

Just a short but really scary looking code breaking challenge. It breaks down into a couple of sentences once cracked. ...
-1 votes
1 answer
439 views

Vigenere text cipher: Udfwavk wcfo nt "zjljhydmu"

Cipher: Udfwavk wcfo nt "zjljhydmu" This cipher is a solution to this which is currently unsolved. This is a special cipher, a Vigenere cipher, with this riddle telling the secret key: All ...
22 votes
1 answer
4k views

Pi is a perfect square!

Explaining math is hard, but when 'squaring the circle' came up in class, I could not resist to explain the connection between circles and squares. I started easy by introducing Pythagoras' theorem. ...
6 votes
1 answer
724 views

Hobbies and travelling

My hobby is to travel, the following hints lead you to my next destination. What is my destination? And how do you know? Hints: Gsv kozxv rh mlg xolhv gl gsv hvz. Gsv kozxv dv ziv ollprmt uli rm ...
7 votes
1 answer
293 views

Weird Programming Glitch

Yesterday, when I was programming, my computer suddenly crashed. When I rebooted, I saw the message flicker before me: ...
17 votes
1 answer
912 views

My GF is a spy?

So it turns out my long-term girlfriend is a spy. I probably should have seen the signs earlier (I guess this finally explains all the wigs and false moustaches), but last night she told me on the ...
0 votes
1 answer
231 views

It's quite odd to decipher seemingly random key-smashes

soolmgeutrijmnelsjtrhyeyeqabsairessbtewqaryptvocsuorlevveaatcjiupnhgezrbifsgtbosilgbnhocreebeoxntoryalmgautbehrtiuagljannfdwihgfngotrveodoirsetvrfaucstviyoynrse== I ...
3 votes
0 answers
182 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 ...
11 votes
2 answers
3k views

Morse Code with no spaces

Help me decode this morse code into plain text. I can't solve it because it has no spaces. Text version: ..-.-..--.-.-...-...-..---.--.....-....-. Ending Part ...
4 votes
1 answer
172 views

Translation from Tangkhul to English - Linguistics problem

Background: Tangkhul is a language spoken in the northernmost district of the Indian state of Manipur. Like Manipuri (or Meitei) and many other languages of Northeast India, Tangkhul is related to ...
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 ...
24 votes
1 answer
1k views

Squares in an alien language

Inspired by Lopsy's excellent puzzle idea, I thought I'd try my hand at coming up with a puzzle that's not simply a real-world language. Once again, we have the square numbers 1, 4, 9, ... , 81, 100 ...
5 votes
2 answers
614 views

You probably don't have the courage to solve this. (THE LIST: PART 1)

ONE DAY, YOU WERE SCROLLING ON YOUR PHONE WHEN, YOUR MOM TEXTED YOU. READ THE STRING OF TEXTS: MOM: Hi honey! On the counter, I have put a list for you to do. But, keep in mind that one step is ...
5 votes
1 answer
514 views

The Final Question of MU episode 1

I played the puzzle game Mu Complex: Episode One, the last question of which leads to this website, which contains, hidden as a comment in its HTML, the following string: ...
5 votes
1 answer
249 views

Escape The Room - Everyone Wants This To Stop

You wake up in a bed - not yours - your eyes squinting from the bright sun in the window. It’s an escape room, you ponder. I need to find a clue. A piece of paper is taped to the window, containing an ...
3 votes
1 answer
314 views

The mystery of 107 numbers

Find the algorithm that was used to create the following sequence of numbers: BAH BAA BBA BAD BBD BAG BBG BAJ BBJ BBC BCC BBF BCF BBI BCI BCB BDB BCE BDE BCH BDH BDA BEA BDD BED BDG BEG BDJ BEJ BEC ...
3 votes
0 answers
3k views

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....
5 votes
1 answer
301 views

Break into Goldbach's safe

You need to unlock a safe by typing in the correct password. All you have is the following note: ...
7 votes
1 answer
1k views

You're the NSA, trying to decrypt a message between two friends

You're a secret agent working for the NSA and you have monitored the messages between two friends for a while now. Suddenly, their messages become encrypted and you're on high alert. The first part of ...
42 votes
1 answer
12k views

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/...
2 votes
1 answer
554 views

A simple and quite fun cipher puzzle

Don't worry, this is my creation :) Goal of this puzzle: Decrypt the puzzle to find out what the secret (final) message is. Each part of the puzzle depends on the previous part (except for the first)....
16 votes
2 answers
725 views

An endless loop in a desolate wasteland

You check your position tracker. Back at the beginning. Slowly, once again, you begin taking steps and counting cracks in the sidewalk. One. Two. Three. Four. Five You look around. Pitch darkness....
7 votes
1 answer
511 views

Mathematicians play hide and seek!

The ghosts of Eratosthenes and Euclid are playing hide and seek. They can hide anywhere in all of space and time, but the pair are in agreement to play somewhere on earth within the years 0 to 2000. ...
6 votes
2 answers
827 views

A Magical Cryptography Puzzle

The following is the first and second sentences of one of my favorite (and fairly popular) fantasy books encoded in a cipher I created a few years ago. I'm quite certain it's breakable, but hints/more ...
1 vote
0 answers
92 views

identify cipher? [closed]

I have this, I just need help identifying the cipher. Any tips/pointers are welcome! Text version (for those who can't view images) ...
6 votes
3 answers
710 views

Why did she choose O6G?

He gave her 8 choices. 7 lead to death, one lets her continue. O6A O6B I6C U6D I6E I6F O6G O6H Of course, he knew she had no idea. He turned the hour glass and gave her 5 items from his suitcase....
9 votes
2 answers
614 views

What is a Tetris Word™?

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles. If a word conforms to a special rule, I call it a Tetris Word™. Use the ...
7 votes
1 answer
280 views

They used to sing together

Who are they? They used to sing together. 16 8 7 7 39 and 6 1 68
3 votes
2 answers
325 views

Was Exhibit 5 of the Chaocipher ever solved, and if so who solved it and when?

Was Exhibit 5 of the Chaocipher (published c.1991) ever solved, and if so, who solved it and when? Chaocipher is a cipher that was created by J.F. Byrne in 1918 as a machine-based cryptography system,...
2 votes
1 answer
229 views

bmf kgf dc yufy ckd yb crysn

A friend told me to try to decrypt this as a fun puzzle but won’t tell me the answer: bmf kgf dc yufy ckd yb crysn He gave me this (which I think is the key or at ...
2 votes
1 answer
353 views

Find the ciphering method 4

Link to the entire series. The message: ...
1 vote
1 answer
186 views

Keybase sponsored this puzzle

Yesterday I found a note under my chair. The note seemed very mysterious so I thought there must be a hidden meaning inside. It read: OJNU OJNU OJNU V YVGRENYYL FGBYR XRLONFR'F PBQR NAQ CBFGRQ VG ...
34 votes
4 answers
2k views

Good Apple Hunting

The boys brought him in for questioning, but I didn't think he had anything to do with this. Not really. I just had to know if he knew anything pertinent about that strange passage in the old man's ...
29 votes
1 answer
2k views

BFTIODFTTWKBCSC

This is my first self-developed cryptographic puzzle. I hope it is neither too hard nor too easy for you to break, and that you enjoy it. Please do not only post the answer, but also your way towards ...
1 vote
0 answers
158 views

A Journey around the Web

Are you ready to embark on a (rather short) journey? Word Wall - 6 groups of 3, with the answers forming 2 groups of 3. The final answers start with T and U. (They come together into a single thing, ...
2 votes
2 answers
197 views

A simple and quite fun cipher: Revisited

Background On October 11th, 2023, I posted "A simple and quite fun cipher puzzle" as my first puzzle on Puzzling Stack Exchange, which was a puzzle where each decoding method was to be ...
18 votes
1 answer
831 views

A puzzle about ERIC

This is a puzzle about (7, 8, 8), or ERIC for short. Can you decode them? IM[K]N, OPQFR ABNP, AC V R[K]T, U R[K]T HIJK L, HIJK JPFH, SFH NPFJ L, NP[J]F V D, EF GF ERIC = ??P??[K] [J]?GFP ?[N]??[K]R
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 ...
36 votes
3 answers
3k 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: ...
4 votes
2 answers
254 views

Is this a known technique or a custom technique?

I recently watched "A Good American," and I'm wondering what the decryption method is that he is using here, or is it a custom decryption method? He slides an array of letters printed on paper over ...
20 votes
1 answer
2k views

How did my younger sister survive?

In a far other universe, my little sister was trapped in a cave. Surprisingly for humans, in this universe, all caves are electronic. This electronic cave had nothing but 5 buttons, two little screens,...

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