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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Cheese from Denmark
You'll need "cheese from denmark" for this cipher puzzle.
Denmark
Portugal 1/2
France "hello"
?AI EBOM AEEDY EHT SEOU EPNHS TNHG OS EPNHS "F" AN AI SEBOM SSEHÆ AI ...
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The Mono-Quantum Condrum
You are presented with a locked box, and on its surface, you notice a sequence of peculiar symbols:
⌬ ⌅ ⊙ ⊡
Next to the symbols, there's an inscription:
...
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Good cipher with a "password"?
I'm starting to create a puzzle, but I'm going to need a cipher that will be impossible (or at least very difficult) to crack, but can be easily decoded with a key. I first looked at the one-time pad ...
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#TenderfootSpiral
Clues:
Two hikers on an incline arrow with numbers.
Hiker 1 says: 38.548493. Hiker 2 says: -105.998749.
Sequence: Hiker 17711 Hiker 0 377 0 144 1 10946 233 987 0 2584 6765 75025
Hiker = ...
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A Trivial Pursuit #07 (Geography 2/4): String Theory
This is part 7 of A Trivial Pursuit, a 25-part puzzle hunt. Each part is solvable on its own, with the exception of the meta-puzzle at the end.
If
e*
t*
u*
v*
w*
x*
y*
is H...
What relevant (if ...
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Find the ciphering method 2
Link to the entire series.
The message:
3, 53, 48751, 9247757, 294914580539
The answer is a 13 letter word: UNDERSTANDING
Hint 1:
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Find the ciphering method using deciphered message
Link to the entire series.
Ciphered message:
...
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Decipher a long sequence of numbers
51699624576811268526783109824167925197245652924177251787241782538786302873119768312852668312686625268245686752824473216878253830287925175273039778250852831287672527245665263006725397251762529312811498
...
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An X x X Slitherlink related to X
This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks.
The final answer is a six letter word.
Prefer no partial answers.
penpa
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The End of the Desert Sauce
Transcript
Clues:
[map compass containing "19!"]
3336665555556669 84433 7777833255 777728822233 8666 77773333 944666 933 64444448 2233
+---+---+---+---+---+ +---+---+---+---+---+
| | 3 | 4 | 5 | ...
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6 types of puzzles I like
I like puzzles where you find out about something interesting.
Mike Wilks
I like image editing puzzles.
I like code puzzles, where the code is not that obvious.
Pakistan Dance Omega Beans Cricket ...
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This is a message encoded in a rather obscure foreign language. What language is it and what's the riddle's solution?
The following message contains a riddle written in an encrypted form of a rather obscure language lacking a literary standard that is rarely spoken today. What does it mean and what is the solution to ...
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Cryptogram or Anagram
Clues:
The answer is 7 characters
Answer can include the following characters: [a-zA-Z0-9]
Ideas:
I first used all characters adjacent to every capital letter and got: "rnaoihd", which ...
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Kidnapper? Some Spacing needed
Prologue
You are coming home from work, happy with your current coding progress (you are a coding and maths prodigy), but then you get kidnapped...
You wake up after some hours of sleep in the ...
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The Poem's in the Wires
Here's one I thought folks here might appreciate. It'll require a combination of codebreaking (or codefinding) and a tiny dab of cryptic mindset.
What poem is written below?
For bonus points, provide ...
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A historical cipher
You are born in the time of 100 BC. Now what?
gvcwndxphufrcshvrtfrnhwnircssynbntnwnnglcufnbgwrf
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Help a woman from ancient Rome find out how her husband is doing
Let's go back 2000 years. A woman named Valeria received a strange message from her husband Claudius who is a frumentarius.
The message:
...
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Relax, I’m Kidnapped! - Part 2
Part 1: Relax, I’m Kidnapped! - Part 1
You manage to solve the crossword, and you show your captor the answers. “Well, you solved it…but I’m not done yet. Go to my room,” he replies. He directs you to ...
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Mathematical Codebreaking
I've created a number-sequence puzzle and dressed it up as a cipher puzzle.
The following message has been intercepted. You suspect it begins with the words ...
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Digit and (Digit) are different!
A, B, C and D are four different single digit numbers.
It is given that:
A + B = D
A - B = C
It is also given that:
A × B = (B)
C × CD = (D)
Questions:
Decode why B and D are enclosed in brackets.
...
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Hidden composer
Today I wanted to make a "logo" for a composer. I liked logos with deeper meaning so I had gone ahead and tried this design:
What composer was I trying to make a logo for?
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Coded human body parts
The table gives information about some of the human body parts.
The names of the body parts are all coded and the count of those body parts present in a normal human are given.
Coded body part
Count
...
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To get the answer, you'll have to get the key first
Below there is a cipher hidden in the text. Read everything very carefully. As far as I know, it will give the necessary hint.
Look for some patterns: Let nobody distract you.
Eventually, you will see ...
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Hiking Circuits
This is part 27 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
How have you been? Today I have toured the coastal towns and islands of a major ...
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Squares in another alien language
Inspired by this puzzle.
In a newly discovered alien language, the following phrases are the pronunciations for the square numbers up to 100 (1, 4, 9, 16 .. 100). Match each phrase with the ...
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Find the secret 7-letter message embedded within this message (unsolved)
Background
This puzzle was originally from a puzzle contest for the USC Viterbi Magazine that is now over, but the answers have not been posted. My friends and I have been working on it for weeks, but ...
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encode in encode
Today, a cryptic message was received by Area 51:
Bananatexteismarvellous605185682252125223459314283216133301
2
The staff managed to figure out that some 2 digit ...
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A take on custom ciphers
There is something hidden in the text below. Can you find out what it is? Note: no computers or tedious work required.
...
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What did I do wrong?
My friend and I were bored so we decided to play a game of chess. I lost, for I have done something bad. I was a beginner, so I could not find where I went wrong.
I wanted to know what was wrong, so I ...
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Cosmic circles and the celestial key
These seven cosmic circles appeared in the night sky:
For some reason, I was reminded of something my great uncle gave me long ago. It was like a disk, but he called it a "celestial key". ...
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The answer is a specific PSE question
uxymu uxymu gry'c drobo xykr xykr gry xykr zvkmo s mkx czoxn dyxsqrd
The answer is a question you can find only on this site.
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Find the next number in these series..?
1, 1, 1, 1, 2, 2, 2, 2, 2, 5, 4, ?
2, 4, 6, 10, 15, 26, ?
71, 194, 38, 1701, 89, 76, ?
5303944, 6677714, 2070936216988528558, ?
1, 2, 3, 6, 9, 9, 16, 20, 18, 30, ?
You know, there is more than ...
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Letters represented as 3-digit numbers
The following cipher appears on the box of a puzzle called "Fire" from Pyro Puzzles:
I know nothing about decryption, so I was hoping one of you would be able to help decrypt it. Thanks in ...
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Decode the ANSWER. Can you do it?
In some code the word EXAM is written as OVSG and TEST is written as ZOAZ then the word ANSWER is written in that code as:
I tried to figure it out and it's harder than I expected. Admittedly though, ...
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Guardian serpent of the ancient pyramid
According to legend,
if you are pure of heart
you will be able to see
the Serpent of the Pyramid
and through your labor
reveal her true letters
and know her wisdom.
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A funny looking cipher puzzle
What secrets does this jester hold? Hints are found down the road.
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Find how this finite sequence completes
7 14 31 51 70 81 104 107 129 149 155 175
192 215 238 259 279
299 301 301 314 328 350 372
Inspired by the discussion with the author of, and the clues to its solution are in that discussion: What ...
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Single word answer cipher 1
DPOHS BUVMB UJPOT UIFGJ STUIB MGJTX IBUJT MFGU:
U
TOB
PD EB
QL C Z
TTF U
LU XI P
B F O
U SOL
V
Hint 1:
As this is my first puzzle, I greatly welcome feedback.
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Important Alien Message
A strange alien transcript, alongside what is believed to be a partial key, was recovered the other day. Scientists aren't sure what the message might contain, but theories point to some sort of ...
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A message from The Federation of Binary Robots
The Federation of Binary Robots had a message, but their binary to English programme malfunctioned. Can you decipher it? ...
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A mysterious message from space
A friend of yours calls you late one night, seemingly very excited about something. He's speaking quickly, and you can't really make out what he's trying to tell you. From what you can understand, he ...
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A binary number and the last cell
01011000010001100100010000110001001100000011010000111000001101010011011100110110
What could this mean?
Take a screenshot once you have decoded and plotted it.
Hint:
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Decimal to message
I have a secret message:
4470638247604044817559339103207250488852606988160972686558960541063247781119710410820484913933821198888332242717068270664790870393005797478769916994593
Can you translate it ...
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Breaking Gnomon Cipher [closed]
[First time posting so apologies if this is an inappropriate question for this site.]
I recently finished reading the book “Gnomon” by Nick Harkaway. At the start of the book there’s a set of numbers ...
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A Theoretical Dive Into the Book Cipher
The following code, of my own making, follows a well-known, standard procedure. However, it may be interesting to note that there is something unique about it. Try and break it---it will probably be ...
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