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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The case of the strange coffee

When you figure out that the guy speaking Gibberish meant you go back to the restaurant the following day, and hope for the best. When you walk in you notice the man who said the Gibberish in the ...
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Dungeon Crawler: Level 3

You are the protagonist in a game designed by NeedAName Inc. Proceed through the levels using your video game knowledge to solve the puzzles therein. Solve all levels and beat the game! Level 3: ...
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Where did this mysterious note come from?

The boy had a cat on the boat, Alone among blue all around. He wrote a very brief note, Hoping the can would be found. I just came back from the Latpipe Hotel and decided to head to the beach, for ...
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Portraits and quotes - Clue Twenty Four

<<---First clue <--Previous clue A note from @Mithrandir: I have given explicit permission for @Randal'Thor to post this, and gave him the answer to encode. If you want to post one, ping @...
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The bakery - Clue Twenty One

<<---First clue <---Previous clue (No, I haven't just gone and jeopardized Mithrandir's entire series, I have been given permission by him to do clue 21.) A note from @Mithrandir: I have ...
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An Unfortunate Conundrum Involving Extremes

The tide recedes as I sit in the fenced garden on my roof. A jagged rock lies ready to wreck the mariner who errs. A seabird screeches somewhere to my rear. Longing, I look at the world beyond the ...
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Hidden message #1

One day I was visiting an unknown forest and I found some mysterious message written on the trees. The message was WEZI SUZNKX JFWYM QT BRX AMPP GLH Help me to decode the hidden message.
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Why the 'Be Nice' policy? - Clue Eight

<---Previous clue You push the buttons under the letters on the rock wall. Nothing happens for a moment. Then there is a rumbling noise. gggrrrrrrrRRRRRRRRRRRRRRRRRRR The rumbling stops. You ...
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Musical Chairs Cipher

Six children -- Alice, Ben, Carl, Denise, Eddie, and Flo -- are playing a game of musical chairs in class. On each of the five chairs is written a seven letter word. The children start out in ...
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Room 5 of the Maze

This is Room 5 of the Maze series. For those wishing to start at the beginning, click here. To go back to the previous room, click here. As you arrive at the answer to Room 4, you realize it's the ...
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Desert Wanderings bring…Ciphers? Part 3

Part 1 can be found herePart 2 can be found here After painstaking, letter by letter, line by line decryption you think over the riddle a little and then realize what the answer is. You once again ...
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Desert Wanderings bring…Ciphers? Part 1

Part 2 can be found here Part 3 can be found here You should’ve know not to listen to that sketchy peddler. Now you’re lost in the middle of the desert with nothing to eat and hardly any water left. ...
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Room 4 of the Maze

This is Room 4 of the Maze series. For those wishing to start from the beginning, click here You wake up in Room 4 after a troubled night of 'sleep'. Your head was clouded all night with thoughts of ...
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Can You Decipher It?

Cryptogram Puzzle #1 Message: cp pl cq gv ud fl qz nt da bq kl ql ha uv dv ht od qt hd "np bf qk wa ud lw fd lx cr dl pe bq rm fl np bf qk wa ud lw fd lx cr dl pe bq mg dV" Hint 1: ...
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The Twenty Doors! (ROOM 6)

This is part of The Twenty Doors series. The previous one is The Twenty Doors! (ROOM 5) The next one is The Twenty Doors (ROOM 7) You go through door 5, and see a rather unusual keypad. ...
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The Twenty Doors (ROOM 7)

This is part of The Twenty Doors series. The previous one is The Twenty Doors! (ROOM 6). The next one is The Twenty Doors (ROOM 8) You (after many days rest in Room 6) finally go into Room 7. The ...
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The Twenty Doors! (ROOM 3)

This is part of The Twenty Doors series. The previous one is The Twenty Doors! (ROOM 2) The next one is The Twenty Doors (ROOM 4) When you finally realise that the cipher used in room 2 was the ...
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The Twenty Doors (ROOM 9)

This is part of The Twenty Doors series. The previous one is The Twenty Doors (ROOM 8) The next one is The Twenty Doors (ROOM 10) When you go into Room 9, there is a strange hint, signed by 'Dr. X': ...
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Texas Numeric Hidden Message [closed]

This numeric hidden message was found on a seat at Rangers Ballpark in Arlington, TX, with an instruction to "Solve the Riddle". What does it mean?
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Some messed up words - Clue Six

<---Previous clue The door swings open, to reveal [redacted] waiting there for you. Your jaw drops. You had no idea that this was so important, that she would get involved. [redacted] steps ...
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The Twenty Doors! (ROOM 5)

This is part of The Twenty Doors series. The previous one is The Twenty Doors (ROOM 4) The next one is The Twenty Doors! (ROOM 6) You go through into room five. There is a standard keyboard, and, of ...
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No Cheating - Cipher challenge

NO CHEATING Today’s cipher is a famous cryptographic method known for its economy, ingenuity, and difficulty in cracking. Its inventor created all sorts of cool things, including musical instruments, ...
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The Great Binary Puzzle - Part 2

You pass the first room to enter the second room. It isn't that dim like the first room so it is easier to see. You see another combination, but this time you see something scraped on the wall that's ...
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The mystery of NOC +10

NOC +10 On March 6th, 2015, a YouTube channel named "Noc +10" was created. Since that day, this channel is uploading some really darkly mysterious videos. I will start saying something about the name ...
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Escape the dungeon, by deciphering the codes and navigating the rooms to find a way out

You have been thrown into a dungeon with many rooms; you don't know who did this or why. You start in room 37. You might be thinking "Why 37?", so I will explain this: "Why not?" You need to find ...
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Unsolved Mysteries: D'Agapeyeff cipher

The D'Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of "Codes and Ciphers", an elementary book on cryptography published by the cryptographer Alexander D'Agapeyeff in ...
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Geography at the pixel level

(enlarged version) The answer is a group of islands.
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A weird deleted Puzzling.SE question

So I was just browsing Puzzling as usual, when I stumbled upon a... to put it mildly, "strange" question: The question seems to be permanently deleted now... For those who disabled GIFs in their ...
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The Curse of the Ancients

The night has grown fearful. It has been a fortnight since the rising - when the dead have begun to shamble out of their graves, hunting and preying on sleeping men and women and children. The people ...
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Word of advice: If someone beats you in a guess-the-song challenge, dominate them

Remember my friend, Jim, who, y'know, gave me that "retaliation" puzzle, which I pretended to be stumped at, just to make him happy? Well, anyone who's met me knows I don't keep people happy for long. ...
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Down the Rabbit Hole

There's a secret hidden in the text below. What mind-blowing truth does it reveal? Not imaginative? Then Zeke's Clues may assist! Unsure, lad? With our patented Obscurity Clues, begin verifiably ...
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The mystery of NOC +10, Part 2

Background Since March 6th, 2015, a YouTube channel called Noc +10 has been uploading puzzle videos about once a week. Each video begins with the same introduction, followed by some form of clues ...
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The Puzzling Times

$$\bbox[orange]{\begin{array}{rcl}\\\hline\huge\ \ \star\ \ \star\ \ The&\huge{Puzzling}&\huge{Times\ \ \star\ \ \star\ \ }\\\hline\\\end{array}}$$   Vol. 4, No. 1 $\raise 2pt \tt{\large{\...
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A Letter from the Past

It has been quite a while since your first assignment as a P.U.Z.Z.L.E. agent. Most of your tasks weren't even half that exciting and since your boss is currently on vacation, your most important task ...
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The Baconian Tower

The picture below depicts Sir Richard Mervyn Bacon, a (very) distant relative of Francis Bacon, leaving his flat on a clear autumns night in order to get his favourite book from the local library. ...
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The Writing's on the Wall

In the course of your travels, you stumble onto a cryptic message: You lament that the three bottom lines are badly degraded and nearly unreadable. You're certain that the information they contain is ...
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Crack the Terrorist's Password!

You work for a secret organization, and recently the personal data of a terrorist leader has fallen into your hands. This would be great news, except for the fact that all the files are locked with a ...
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An Odd New Technology

Since it's Friday, and I'm really looking forward to the weekend, I've created yet another riddle for everyone to try and solve. The Puzzle I was in my chemistry class the other day, and I noticed ...
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What is the cipher behind this circular cyphertext?

I have a cipher and I am wondering if - provided you have both the cipher-text and the clear text, given below, can you describe the cipher which was used? The cipher-text is in this image: I ...
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Whisky treasure-hunt: Cryptogram which refers to a place in Scotland

UPDATE 4 - Inserted original list of questions (no more, no less) Could someone help me solve this code? I've tried for 35 years. 13 25 22 19 9 30 32 11 12 25 8 29 17 It is a place name in ...
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The Alien Message: What does it mean?

"Three hours ago, we received a urgent message from one of our exploration agents. I'm just going to play it for you in full." "I'm on Planet 193843. I've found a large stone block, 2.64 meters high, ...
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Real life puzzle: Unknown alphabet or shorthand

User JellicleCat posted this on linguistics stackexhange a few years ago. None of us were able to come up with a satisfying answer but most seemed to agree that it was an idiosyncratic cipher or ...
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My friend is lost in time!

YOU HAVE TO HELP! I was time traveling with Fred last week - you know Fred, he's a nice guy - when we got separated. His hand-held automatic chronological portal manipulation and guidance unit (...
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Which Flight Takes Me Home?

My vacation just ended, and I'm at the airport headed back home! It was definitely an enjoyable trip, but it could also be described as, well, unusual. I've got a more immediate problem though. I've ...
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Murder of the President - Part 5

This is Part 5 of the Murder of the President brainteaser/riddle series. If you have not already, check out the answers for Murder of the President - Part 1 posted by Nit, Murder of the President - ...
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Friend passed me this note after lecture

After my linear algebra lecture ended at 3:30 today, my friend passed me this note, but it seems to be encrypted in some way that I don't understand. What question is my friend asking, and what is the ...
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Weird messages from a friend

I'm really worried about my friend Friedrich, until today I haven't heard anything from him for the last few weeks. I decided to message him and ask if anything is wrong, and he responded with some ...
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Help me with our discovery!

Recently, the grandfather of one of my friends died, and I helped him clean up the storage room he used. We found a lot of cool stuff there (well, he was alive during the occupation time in the second ...
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Treasure hunt 'round the world! (Interlude 1)

If you're interested in starting the treasure hunt from the very beginning, check out the prologue! Upon your arrival at Parc Natural de la Vall de Sorteny, you're greeted by a group of ...
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Coordinated efforts

I was showing off my knowledge of obscure geography trivia to my father. He admitted he'd never remember all those details, but insisted that there was a certain other topic where nobody could ever ...