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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6
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3answers
306 views

How to Make Non-too-broad Cipher Puzzles?

// I'm not sure whether this is better to be asked here or on meta. Unfortunately, many people (or at least my friends) agree that puzzles are plainly just "random guessing" in a sense that they ...
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1answer
233 views

This picture has some hidden message. What is it?

This picture was uploaded for the Olympiads of Medicine, from Porto. While the answer might be in portuguese, I don't find it likely. I tried some Caesar Cyphers, I assumed the colours represented ...
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Need help to decipher this encrypted text

I am relatively new to deciphering texts and I have the following ciphertext: xbt ufp ekyzkikn dt nkojvhk? e ndmr jfo nggv du kwjt gun pjv. I tried Caesar Cipher but to no avail. It would be ...
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What's my favourite book?

I got a strange message from a friend a few minutes ago: You wanted to know what my favourite book was? See if you can work out the answer. I'll give you a clue: Saranac Lake \United Which ...
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1answer
114 views

PSE x Wiki x World: How can it be?

The following is a encoded first line from a Wikipedia page. Your task is to decipher it. Enjoy! 239#27#682 372#52#41#599#995 354 856 227#886#244#82#94 252#681 672#61#32#239#246#673-376-599#46#597 (...
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Where is the money?

When I was just a little kid my parents died in a terrible accident, and I was left alone in the world. When I reached the age of 18, I received an envelope with a letter that read the following: ...
4
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1answer
181 views

Alternating Audio Waves

Try solving this cipher from these strange memos: Memo 1 Welcome Comet, today's Thisbe plus Russell here! Memo 2 Reading outlaws loudness. Memo 3 Retro memo: Berlin today upheld voting ...
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Solve it… Uncover the mystery!

One of my friend, who is really too 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. That's ...
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Same Riddle Different Answer: I am both lock and key - who am I?

NOTE: Though the body is identical to I am both lock and key - who am I?, a different answer is expected, and thus this is not a duplicate. Cyrnfr qb abg pybfr guvf dhrfgvba.Thanks! Enter! Small or ...
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My Grandpa's Box #1

My grandpa died last month. At the reading of his will, he left me a strange wooden box. A post-it-note on the side read "You were always good at puzzles." There was a number lock on the front that ...
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Is there a secret message in the first decimals of PI?

Is there a secret message encoded in the first decimals of $\pi$? Source: Vi Hart
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1answer
326 views

Crack Me 01 - Crypto Riddle

This is the encrypted message: xy}v"|y#xu|$|&a+&y}vsa*pppp*fprppp"prpp"upppzpqppp*"vptp|at~!*+p)~yr%"&t"&y}vsa* This is a riddle in parts, follow ...
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Puzzle hidden in Hannah Fry's Hello World

Hanna Fry announced today that she hid a puzzle in the cover of her book—via twitter The initial clue seems to be a binary encoding of some ASCII. I was hoping to start a thread towards finding a ...
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377 views

Who is John's favourite painter?

John being his usual self forgot the name of his favourite painter. He went to the Oracle for assistance but inadvertently walked in on her while she was busy eating pie. Angry at the interruption, ...
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264 views

Riddle Number Seven

Seems as if I've left you all a little puzzle for today. It's a simple cipher that I'm sure you can all deduce. Everything you need is provided in the image. Have fun everyone!
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467 views

There is a secret message in the picture #3

This picture is from the 50 trillion dollars challenge from the free ebook "Muko and the Secret". This one is already solved by a reader.
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4answers
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Riddle Number Six

Fiddle diddle diddle, time for another riddle. This is another little puzzle I've concocted for you all this evening. The scenario is this: You awake in a small room with only one door. The door is ...
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228 views

Riddle Number Five

I feel as if my challenges are a bit too extreme for many, so here is a more simpler conundrum to solve. The cipher used is the same as the answer to this riddle: When is a cipher like a person who ...
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1answer
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In Time or out of Time, that is the question

Brushing away the tree roots hanging from the ceiling I realised that the unicorn had stopped. “I will not go further,” he said in his deep, rich voice, “you know the prophecy. There is only one who ...
4
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1answer
269 views

Riddle Number Four

Time for a more challenging encryption, seeing how riddle #3 was decrypted so easily. First, I must note that this encryption was inspired during a chess match I partook in. I call it the ENIGMA ...
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1answer
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Eternal Bond | decrypt the message

My father was never too close to his kids, but when his fishing trawler mysteriously disappeared in a storm to the South of Guam, his wife and her three sons still felt the loss deeply. I, being the ...
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533 views

Time for the Dessert!

The answer is one word. Hint 1: Hint 2:
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352 views

Riddle Number Three

Time for a challenge! Here, the riddle is encoded using a specific cipher. You must decode the numbers and answer the riddle correctly to solve it. Good luck! 83191143|2367|02|41026731|434771|02|...
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Which logo does this word represent?

Puzzle 1 Which logo does the word dsPlinS represent? 1. 2. 3. 4. 5. I haven't posted in a while, but I'm back on track, baby! And to celebrate my coming back, whoever solves this would earn a $...
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Sukarno's Holocene Extinction Discovery

You are a renowned paleobiologist who travels the world and evaluates recent discoveries. You recently were contracted to fly to Jakarta University and check in with one of their researchers. You ...
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127 views

Another challenge for you guys

Ciphertext: ...
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1answer
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Little challenge for y'all

Ciphertext: ...
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314 views

This poem is complete, except the solution to it

First, hide the text, come on, no spoilers here; Second, bash at it, you have nothing to fear; Third, pair up and basic pigpen, flagging every time; Fourth, use the force, wait, no, ...
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Four boys are playing football and one of them breaks a window

Four boys at school are playing football and one breaks a window. No one owns up to doing it but someone gives the teacher an anonymous note saying: hE iS thE CuLpriT? The four boys were: ...
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1answer
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A chess game with odd moves?

A friend and I like to play chess regularly. Like me, he is a lover of a good puzzle, which is what drew us to the game. The thrill of finding a checkmate in a board riddled with pieces cannot be ...
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Find the number [closed]

Ocz vinrzm dn ji ocdn kvbz Find the numbers
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Monoalphabetic Game Theory

This is a third puzzle from the Monoalphabetic Equation series, you can check out the previous one here: #1, #2. Last night, I went over to my friend's house for our monthly game night. After we ...
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478 views

In a certain code language if CONFIDENCE is coded as FGPEGEQPHK then how will PERFECTION be coded in the same language [closed]

A certain code enciphers CONFIDENCE as FGPEGEQPHK. What will it do to PERFECTION?
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How do I go about solving this cipher?

A friend and I signed up for a pay-to-play D&D campaign some time ago. Near the start of the campaign, our characters were given a puzzle to figure out. We're approaching the end of the game in a ...
5
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1answer
335 views

There is a secret message in the picture #2

There is a secret message in the picture, can you find it? This solution is also a clue (how to solve) to the previous one - There is a secret message in the picture. This picture was neither used ...
5
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2answers
668 views

There is a secret message in the picture

There is a secret message in the picture, can you find it? This picture is from the 50 trillion dollars challenge from the free ebook "Muko and the Secret". This one is already solved so I hope I do ...
5
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2answers
2k views

Mysterious email message

Today I found something quite interesting in my email. An xml file with this puzzle: -|- |-| 0_ |\/| 0 0 |\| | § |_ | -|- Can you solve it for me?
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1answer
595 views

Monoalphabetic Geometry

This is a second puzzle from the Monoalphabetic Equation series, you can check out the previous one here. A set of letters has been replaced by $a$, $b$, $c$, and $d$ and one symbol has been replaced ...
10
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1answer
594 views

Monoalphabetic Equation

A set of letters has been replaced by $a$, $b$, $c$, and $d$. Following are some of the words that consist of those letters, and their meaning: $abc = a\ title\ (n.)$ $abcd = a\ title\ > ...
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1answer
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Transpostion cipher help

Could I have some help with the following cipher; I have very little idea about how to start it. It's obviously a transposition cipher of some kind but I can't seem to find the key or figure out how ...
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1answer
150 views

Looking for Cipher Help

This cipher has me vexed. FOOTOOLTLTLBDCLOLTLTJBFTOCFTOOOCDC. There appear to be too many Os(and no other vowels) to be a transposition cipher. The coindidence index is 14.75, which is quite high, ...
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What a strange program

My friend told me about this program he installed recently. It seems very strange. I don't know how it works, it's just a prompt with a welcome message which shows some messages. Here are the ...
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376 views

A puzzle about 13

Round 1: Only thing you need to do in this round is solve the cipher, you'll need 13 along the way. The solution will guide you the the next round. ...
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1answer
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Top ten best ways of transportation

This is an entry into the Fortnightly Topic Challenge #41. Last night me and my friends had a fun night at the bar. When it was time for us to leave, we couldn't come up with a transport that will be ...
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257 views

The 2 terrorist chatroom cipher

you are finally here! We need your help, a group of terrorists have been talking to each other on their newly developed "HackerChat" app and we think they are up to something. Here are the logs: <...
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1answer
90 views

Deciphering Old Runes (or: What's The Program?)

Some background: I was going through some old photos of mine, and I came across old doodles I had made during algorithms class (while getting my bachelor's in computer science). I remember these ...
3
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1answer
96 views

A Friendly Challenge Cipher

I have bought a game card for a friend for his birthday. One of those cards that comes with a code that you enter for in-game currency, but I can't just let him have it without messing with him a ...
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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'...
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A cipher for people who don't normally enjoy ciphers

I've never been a fan of ciphers/encryption. Truth be told, despite my love of puzzles (and the amount of time I spend here on Puzzling.SE), I'm just no good at them and haven't properly learnt the ...
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Word Cipher with seemingly random numbers

I came across this interesting puzzle and have failed to crack it for more than three days. Can you solve it? m.imdb.com/title/tt2039338/ L=9, 20, [2x5], 6, 17, 13 W=38 The only tips I ...