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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Where Is The Treasure?

Nuja, dying pirate, the last of his clan, wrote a letter to his nephew trying to tell him the location of a treasure he had buried sometime ago. Knowing that the facility of prison hospital would read ...
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Encrypted Titles

Let's keep this movie train rolling! Below are a handful of Academy Award Best Picture winning movie titles, but each has been encrypted somehow. There is a common rule determining the encryption ...
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Preparing for the end of term performance

It's the first full week of term at Farthingbottom School and Portia, Felix, Primula and Randolph have arrived in the music room for their lesson. Professor N. Igma is nowhere to be seen, but he has ...
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Lost In Translation: Hard Mode

Having proven your worth in NASA's test, you are allowed to work on the alien message. NASA experts tell you that they suspect that the language is a transcription of our letters/words written left to ...
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Lost in Translation: The Test

This just in: an alien message was received on Earth!! It seems some extraterrestrial species has contacted us in a language with symbols similar to our own--presumably for our convenience. You, a ...
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Strategy for finding the key to this cipher

A coworker and I are perplexed over this puzzle. We gave up and looked at the answer, but we cannot seem to understand how it works. Can anybody explain? Text version of the above image We've ...
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A long night of stargazing

After a long night of stargazing, your best friend left you a cryptic note. A single sentence is written on the note, in beautifully printed cursive: I softly gazed nigh a lit, dull skyline, ...
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Where to ask these questions?

Here on SE I've only answered questions so far, so I thought it was time to ask some of my own. But where should I go to find the answers to these questions? Would a tsubo-niwa garden help with my ...
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Cryptic message from a former SYSOP

Your sysop recently quit due to what the law division calls "internal struggles". Less fancily, he hated you, and he hated his job. As a parting gift, he left you a program entitled SwanSong.c. Being ...
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I think there is a hidden message on Burning Man Information Radio

Background: There is a year round Burning Man "radio station" called BMIR -Burning Man Information Radio. (BMIR.org) 11 months out of the year, it is just streamed with no commercials. Starting 2 ...
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A humble little symbol riddle

{um} - [] ⼔erized The answer is a common phrase. (Though note that this doesn't mean it's a famous phrase or that it often stands on its own.) If this is too ...
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Two dead beans on a stone

Samuel Bean, a Canadian doctor, had a tombstone erected in Rushes Cemetery near Crosshill, Wellesley Township, Ontario, for his first two wives, Henrietta and Susanna. The original stone was carved in ...
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The Temple Of Demdarr, God Of Puzzling (Part 1)

Prologue You're a adventurous treasure hunter that just entered the first room of "The temple of Demdarr", an ancient temple in the arabian desert. It is rumoured that you have to pass three tests (...
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The Monolith of Puzzlandia

I've been avidly lurking and sometimes posting on Puzzling Stack Exchange for a few months now, and I thought it might be time for me to try a puzzle of my own. I hope it's interesting and difficult ...
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“Rearrange the alphabet” puzzle

I've been trying to solve this for quite a while, it's been about 1 week. My friend sent this to me to solve it. Please do help Xabj, lbhe yvzvgf, fgbc obgurevat zr, gunax lbh!!
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Something for the real fans

Terry guessed the key based on clues she got from Jack In a music-linked movie roughly three decades back But you need to start from a more continental track From Harold G to Harrowing (as Schmieder ...
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John's revenge!

You are a spy that wanted to find out the job of a man named John. There are 100 glasses in front of you. There is also a note: Hello! 99 of the glasses in front of you are poisoned! One is safe, ...
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Math is Hard ! What is the Rule?

These terms are all decoded in a certain way or they follow a certain rule. Your job is to figure out how to encode the last term. ...
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Which door leads to freedom?

You wake up in a room. In front of you, there is some paper: It's the day, not the year or the month! It's very useful to abecedarians. 639407344. But never forget the time, for its another key.Jsz ...
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End of the Maze

This the final installment of the Maze series. Here is Room 1 and here is the previous room. After you enter the answer from Room 5, you wait for the door to de materialize as usual, but nothing ...
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A letter telling my great-great-grandfather's death-day

Yesterday, while I was tidying my attic, I found a letter dedicated to my great-great-grandfather. (Note that the letter was inside a box which my great-great-grandfather transmitted to my great-...
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The strange SMS (Part 3)

It is very hard to communicate with my friend, as you can see here and here ... The next day I was finally able to talk to him, so we decided to meet in a real place (the last one wasn't safe enough). ...
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Friend gave me a note I am not sure how to read. What does it say?

Tim Hansen gave me a note last week as we were leaving lunch and heading back to work. The paper was folded into quarters, and there were no directions to help understand what was written in the ...
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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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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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The strange SMS (Part 2)

Thanks to all of you, I know now what my friend was telling me (see part one). We continued talking via Skype. After some nice messages about the utility of iron in our society, we decided to meet in ...
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Room 3 of the Maze

Exhausted from the effort of solving Room 2, you try to get a good night's sleep, but your sleep is interrupted by vivid dreams of fblthps, numbers, and vectors. The Maze is getting to you a bit, it ...
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The strange SMS

I was talking with a friend via SMS when suddently, he sent me a strange message : ...
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Room 2 of the Maze

Still excited about your quick triumph over Room 1, you head straight for the suspended note and read it: Congratulations on making it through the warm-up to Room 2. From here on out, getting the ...
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The Twenty Doors (ROOM 10)

This is part of The Twenty Doors series. The previous one is The Twenty Doors (ROOM 9) There is some paper taped to the door in Room 10: Well done! You are now halfway! To mark this event, this ...
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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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Pass the test, become an adult!

In the distant future (specifically the year 2025)... Welcome to Pluto! Until now, you have had an idyllic childhood in the Zetetic Zone, solving Space Riddles and Space Crosswords and Spacedokus. ...
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The Twenty Doors (ROOM 8)

This is part of The Twenty Doors series. The previous one is The Twenty Doors (ROOM 7) The next one is The Twenty Doors (ROOM 9) You move on into Room Eight when Kslkgh (a.k.a. Dr. X) finally creates ...
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What's Jeremy's Encryption Algorithm?

As a result of their solutions to this puzzle, store owner Jeremy promoted both Cerberus and Quark to top managerial positions. Soon after starting their new roles, they were somewhat surprised when ...
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A love letter - or is it?

George always has had it with the girls. Those who don't find him irresistible at first sight could usually be won over by a ride in his shiny red sports car. If there has ever been a problem with ...
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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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Mars mission trouble? [closed]

It's the year 2034 and you're a mission coordinator for the latest Mars mission. It has been a long haul but since the send off on January 12th the antimatter rocket has been a complete success. Your ...
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A Logical Puzzle

Here is a block of cipher text C: 28 49 3d 57 2f 48 20 7c 20 7b 4e 7d 3a 49 27 57 27 48 20 45 29 20 3c 2d 2d 20 28 7b 5f 5a 7d 3a 58 20 7c 20 7b 36 5f 27 30 27 38 5f 7d 3a 58 20 41 29 Please ...
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Finding Mr. Rich's Password

It was a slow day at the office. Despite its name, Problem City was fairly quiet as of late. Joey was slowly melting into his chair when he recieved a phone call. Joey slowly swiveled his chair to ...
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Dedicated image - but dedicated to what/who?

This puzzle belongs to the puzzle series: hyper-modern art After solving the message in the butterfly image, the two friends move on to the next room. "This was certainly an overwhelmingly large ...
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Conquering the Universe

Can you decipher the numbers and determine who I am? 24083272403040832724032608240304120727327240824071232724082308 This is my first puzzle and I have no idea how ...
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Riddles in the Dark? Nah, just ciphers in the shadows

Annatar stepped into Celebrimbor's forge, watching for a second. Then, he spoke. "I wish to test you, to see whether your mind is as good as your smithing." Like any Noldor would, Celebrimbor ...
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My evil brother scrambled my letter!

I decided to write an email to some friends one day. Unfortunately, my evil brother applied a code to it. My friends called and asked what it was supposed to say, but I've forgotten what. Can you help ...
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Knowledge is key. Skill is not

First let me tell you this. The first is easy, then it MIGHT get harder - depending on knowledge. This is all knowledge and no skill - take that as key. I like to call this one the "Stage Cipher" ...
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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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Riddle to code, What am I saying?

The First provides me with gadgets. The Second is seven doubled. The Third is at the begin of endings. The Fourth is difficult to differentiate in certain languages. The Fifth is in the start ...
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Clueless Encryption

What method has been used to encode this message? ...
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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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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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The Twenty Doors (ROOM 4)

This is part of The Twenty Doors series. The previous one is The Twenty Doors! (ROOM 3) The next one is The Twenty Doors! (ROOM 5) You now enter room 4. This one has a load of A's and B's carved ...