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.
1,618
questions
4
votes
1answer
151 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 ...
-1
votes
0answers
78 views
A Z340 question from a competition anybody know how to solve it? [closed]
ACFSOAGGSDEOFEEDC
BRSAOBNLHHHOESOVP
EWWEALRADAATOWLER
TFLIITNECBENSWRNE
TTRICTTBANHBRTYAT
NEOTONOHHOLGAAWUZ
RUTNTETAUGOMYIRGH
EAIMTIHROLPASBTNL
EEWTNIOTRTRLLNEEI
is the output from https://www.dcode....
10
votes
2answers
2k views
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 ...
10
votes
1answer
297 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 ...
2
votes
1answer
209 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 ...
5
votes
3answers
302 views
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 ...
34
votes
3answers
1k views
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 ...
2
votes
0answers
112 views
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 ...
2
votes
1answer
183 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 ...
-6
votes
1answer
141 views
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
0
votes
0answers
168 views
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?):
...
2
votes
1answer
135 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 ...
-3
votes
1answer
108 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 ...
3
votes
2answers
156 views
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-...
4
votes
1answer
328 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, '...
-1
votes
1answer
229 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 ...
2
votes
0answers
147 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 ...
3
votes
1answer
165 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, ...
7
votes
1answer
244 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 ...
0
votes
1answer
149 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 ...
1
vote
1answer
100 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 ...
3
votes
0answers
217 views
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 ...
2
votes
1answer
155 views
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 ...
0
votes
0answers
132 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!"...
0
votes
0answers
175 views
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 ...
-12
votes
2answers
198 views
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 ...
8
votes
1answer
774 views
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 ...
2
votes
0answers
200 views
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 '...
6
votes
1answer
275 views
1
vote
1answer
99 views
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..
-1
votes
1answer
140 views
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:
++ ×× -- / ×= ×÷ -- -÷ / -= ×÷
4
votes
2answers
563 views
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 ...
11
votes
1answer
457 views
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 ...
1
vote
2answers
214 views
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. ...
8
votes
2answers
655 views
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 ...
56
votes
1answer
3k views
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 ...
8
votes
0answers
288 views
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 ...
1
vote
0answers
124 views
“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
...
3
votes
1answer
189 views
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 ...
74
votes
1answer
4k views
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. ...
3
votes
1answer
169 views
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 ...
5
votes
1answer
281 views
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 ...
16
votes
1answer
512 views
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 ...
15
votes
1answer
362 views
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!
5
votes
1answer
244 views
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?
...
4
votes
2answers
424 views
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 ...
2
votes
1answer
227 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 ...
13
votes
1answer
539 views
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 ...
2
votes
1answer
82 views
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 ...
1
vote
2answers
250 views
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 ...
