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.

Filter by
Sorted by
Tagged with
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....
-3 votes
0 answers
60 views

what kind of encryption is this? [closed]

I have an encrypted puzzle that looks like DI S QZAH M 4? <> >? Z $; >@ =9 45 ?H? associated with the CRYPT clue. do you have an idea of what type of ...
5 votes
1 answer
300 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
508 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
717 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
823 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
82 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
702 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....
5 votes
1 answer
470 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 ...
9 votes
2 answers
611 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
270 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
312 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
221 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 ...
5 votes
1 answer
519 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 ...
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
144 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
187 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
819 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
643 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,...
-4 votes
1 answer
320 views

Vinegar on Caesar Salad

...
20 votes
3 answers
1k views

Maze-Jigsaw Fusion

Hello there, maze lovers! Tired of solving normal mazes? Here is a maze puzzle with a little twist: a jigsaw-maze! The circular maze has been divided into four quadrants and scattered, so that you ...
19 votes
1 answer
946 views

Anyone Seen My Snorkel?

This is part 54 of the puzzle series Around the World in Many Days. Each part is solvable on its own. mqoı ugw7qж , zqv qw o h6ım v6ınɔ ugwo7 | zo 78վn £þxm εıqm conxnøqxw v8կox h6ımw , დnɔ þn 7დvn ...
4 votes
0 answers
309 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?
6 votes
1 answer
733 views

Michel's cryptic kana

My friend Michel is at it again. Today I found this email in my inbox: Subject: おいじゃくしゃあむう いみしゃあ りょん ぎをえしゃきょお てば おんない あきわんのんこお しいしゅう ぞびいけえ るう りゃいじい るう りょん わぐ えきゃ。お うてにょいつ うた ごりゅえや ごんをいれんや ううせえにょうさいじゃ ...
11 votes
1 answer
698 views

A relatively easy cipher

You are the head of the cryptanalysis department, and you are pretty nervous because you have sent your best field agent, John, who also happens to be a cryptographer in your team, to find out who in ...
3 votes
1 answer
135 views

Peterhead Codes and Ciphers Club: Weekly Challenge II

This is another cipher-based challenge I created for my club. The story you uncover is generated from Crusader Kings II. The events of this challenge precede those of the Reverse Engineering challenge....
16 votes
1 answer
1k views

A (trigonometric ?) cryptography riddle

Tan: Why did sin eat a sandwich? Cot: Just cos! After seeing this small "joke" made by Tan and Cot, Sin replied: "Well, I have something better than jokes: riddles! Can you solve this ...
31 votes
1 answer
743 views

For a puzzler such as you, you shall solve with ease

Your pet cricket has disappeared, due to its undying loyalty and steadfastness you assume foul play must be afoot! After looking around for any signs of confrontation, you find none, but thankfully ...
-2 votes
2 answers
469 views

The Answer Exists - Cryptography

I have a nice riddle for you. It involves cryptography. At last, he thought. We're finally out of this town. "New town, new beginnings" said to himself. Row after row, they passed through the ...
13 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 ...
3 votes
1 answer
328 views

Cipher I found: O_OO|O#|~#|OO%|

Here is the cipher you need to solve, it is an actual English text: ...
17 votes
1 answer
1k views

Puzzle from Pythagoras

Pythagoras wants to… If 1a,2b,20k,50v and 600x Then what is 100 10 1000 3 ? My original puzzle
-6 votes
1 answer
172 views

another rotten puzzle

Transcript: ...
-3 votes
1 answer
212 views

World Puzzling Competition #2: bobby's transformation

Previously: This year, you were invited to attend the WPC, otherwise known as the World Puzzling Competition. The organizers also seem to suggest that there will be a 50 reputation bounty for every ...
8 votes
0 answers
669 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. ...
11 votes
2 answers
828 views

"I like things done once"

You disable the security shields. Dr P releases his minions. Suddenly you hear the red siren. 'Code-Red' says the computer. You smell smoke. You see the background a blur and noises in the air. Your ...
5 votes
4 answers
601 views

Finding a serial killer

Recently, in the United States, there have been multiple murders all over the country. Because of how similar these murders are, it is believed that a single individual is responsible. There have been ...
0 votes
1 answer
221 views

A QWERTY-based keyboard puzzle [closed]

There is a puzzle and clue. Answer is one (real) word only. Riddle: dtqrgvl Clue is: qwerty based keyboard
31 votes
0 answers
3k views

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, ...
3 votes
1 answer
198 views

These words are for you alone

Can you decode the message this tablet contains? Good luck! Note: The knowledge tag is by no means necessary to solve this puzzle, but certain knowledge could be helpful in verifying the answer. ...
1 vote
0 answers
245 views

RO:09-RI:10-PO:05-PI-22

One of my friends who is good with cyphers and puzzles challenged me to solve this one. I think it reveals a name, or date or some information with which he can surprise his friends. I couldn't find ...

1
2 3 4 5
39