# 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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### What's Happening on my Vacation?

I'm on vacation right now! I left on the 13th in celebration of my birthday! It was a long flight so I brought along some reading material: ...
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### A mysterious email from Ryanair

You are a secret agent in the service of the KGB, and after a setback when the higher-ups thought your cover had been blown, you have embarked on a highly dangerous mission to infiltrate MI6. Under ...
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### A simple? cipher

Translate into a sentence: 1 10 202 010 2011 2020 101 1 202 12 1202 11 0 2011 2020 101 0212 0102 11 0 211 0102 There are ...
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### I'm a natural in math

I'm a natural in math. The variants of numbers to solve me don't go higher than 100 and 26. What am I? 53 61 23 41 11
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### Convert to a sentence

Here is a sequence of numbers, convert to a sentence. 123 436 200 142 166 341 401 304 216 255 143 304 303 211 320 303 303 214 336 Note: There is a logical and basic answer to this. ...
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### Cryptograms in invisible ink

Solve the followng encrypted message. --2b1-21-1b112----b1b---21-b--12--1----b1b---b2-12-1--b22---2b21--211---b--121b-121-b21bb--b2-----211-1-b2b1---1b-12----2b21--211---2112b112-12-111-b2-----21b-...
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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 ...
908 views

### Seven Segment Cipher

In math class I asked my friend what she did for a job. She simply handed me this note. What does it say? Note: You may need a calculator! Then again, you may not...
685 views

### Decrypt this Cryptogram: cs.aoa.daso

The encrypted text is: (. is a letter separator and <br> or line break is a word separator) cs.aoa.dasocs.fsi.rxhgs.al....
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### The puzzle is to decrypt this encrypted text. (Cryptograms)

The Encrypted text is: 7q7f 93d4 6s03 8aua 3pn9 73wu 9l2l a1wx 8u52 9tld 6fhc axfx 8kn4 628q 4abk 314d 255s 5o5b 9cc1 5904 4sja aa1r 7fai apsw 80ph ai09 ejbs I am currently (at the time of posting ...
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### Complete the sentence

I forgot to bring my 110 69 119 67 101 108 76 112 72 111 78 101. Hint:
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### Prince of Thieves

A mysterious thief spotted a girl with many gadgets and jewelries. After a few minutes, the thief attacked the woman and get all her gadgets and jewelries. But there's a one gadget that the thief ...
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### We found this mysterious text in the file of one of our employees

We found this mysterious text in the file of one of our employees and wish to discover whether it is anything we should be concerned with. We know that it uses two substitution ciphers. Even-numbered ...
408 views

### Thats a lot of wasd's

Solve the following code dd ddddw ssaa wawasa ddw ds wasawa w d ds ds aw aa d ssdwdsd wwd ssaa aaw dwdsdwd ssaaa wwdddd ssaaa awasawasaw dds sw dddww ssd That is a lot of a, s, w, d's ...
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### Can you crack the Magic Diary's encrypted message?

Can you help find the hidden message in this encrypted text? A young Science student / Stack-Exchange enthusiast stumbles upon a magical encrypted diary of a fellow he has always admired. He finds ...
210 views

### A Cryptogram for weeding out the riff raff

The cipher is astounding. Prja, Y ekd psjlymd fuev yfr lywrqy Gily fsxovh k yfovl Pjqm k dvshr ug k htu Dsxr br km qbya povl. Prja yy ljuph zq ii Oe yuph zq nr dttitydq Jq jkf k ...
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### The work of William Shakespeare?

sONneT NUmBEr 18 -- ShAlL i COMPArE theE to A SUMMeR's day? ThOu aRT MOre lOvElY aND more TEMpEratE. rOUgH wiNDS dO ShAkE tHE dArLIng buDs of MAY, anD SuMmER's lEASE HaTH aLl ToO ShOrT A datE. ...
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### Crypto-Riddle: dce,/hcv uc

Here is a simple cryptogram riddle which can be deciphered without any software/assistance: N.m msc uc b. aysxcvo Alxans /msh,yg un tmbb.yso >./si ,bs ,yrcvbcd! Answer how you decoded it,...
827 views

### riddle-ception!

Find the key to a popular cipher and find the inner riddle! ViTal ciTy bridges keep it together, Under darkness hardly MeeTing thE weather. It Populates many but kills too, utteRing Fare well and ...
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### The Universal Language

Or should I say, a CoSmOs CrYPt? This was found inscribed in a rock in the middle of the desert. Perhaps the ancients knew more about the sciences than we thought they did - after all, this puzzle ...
619 views

### A test of mental acuity; Identify me

When I spike, you will get quite enthused, For great strength, I am often abused, I am quintessentially male... The next line might derail: With Hashish amiga, my name's all confused. Who or ...
327 views

### Dimensional Analysis

My friend drew this diagram to help him remember his password. "It may seem like just a bunch of squares", he said, "but once you put it all together, and read it the right way, you'll see it." What ...
262 views

%#@! I have overslept! %#@! I stubbed my toe on the bed leg! %#@! I'm splashed from a puddle at the bus stop! %#@! I'm late for Telecom 25 Lab! %#@! The professor is near the door as I walk in! %#@! ...
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### Coded Message from M

A friend dropped this code on me, and gave me no hints besides that it should be a simple enough code to crack, but no luck on my end. (It might be fantasy based was all I got, if the words come out ...
509 views

### Cyclical Vigenere poem!

This is a new idea I just came up with. I'm going to tell you exactly how I constructed the following ciphertext, and your task is to extract the plaintext. If you really want a challenge, you can try ...
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### Ugh, an other crypto puzzle?

There is no cheating this time, no brute forcing my cipher, for once try to play fair. I really like crypto puzzles, the hard part is using classical ciphers. If you were to use the modern ciphers ...
237 views

### Another crypto-limerick, this time from Verdun

Traditionally, after the limerick from Peru comes one with even fewer lines revealed: There once was a man from Verdun, Ekptl hkndekbmq eff oopqvodw ro gkhl uhr. Ol onrh lts r fbel, Gash ona ...
306 views

### A crypto-limerick from Peru

There once was a man from Peru, Whose limericks all stopped at line two. Rpl xcjd jfi yfo, Cw hzhyywh ot iojet, Fdy ovjyu ozmn tdz spg yxz oet yxmgybm. Can you figure out what cipher this ...
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### A row of two-colored circles

One day, as you go to work, you find a string with some two-colored circles glued to it: At once you remember that a mysterious man, who you met on the previous day, had told you that he will send ...
1k views

### Puzzle out the Cryptogram Patterns

So I haven't posted very many questions and I'm not yet very good at figuring out how many clues to include. In addition, I realize that the key behind the third cryptogram is not at all obvious so it ...
398 views

### A crypto-limerick

If you AES the last line, With a key made of something divine, And then you XOR The SHA-1 of "4", FWqY58QhWVqPDX0uQ8C37AYaPeWFab42F2nyuY+zWK/gCV2bo8hIDt6sjon1I8+...
487 views

### difficile est saturam non legere

Well, my last question wasn't received that well, nevertheless I will make a better one, besides you will need all the answers you can get. vcejssnr Now I can't leave you with a stupid cryptogram ...
315 views

### Mirror of men! he showers, with liberal hands,

lxwhmlnv lhlib mxbwhmlnv lbnJ I wonder how long it will take, should not be too difficult, but not to easy either. Please let me know in your answer what you think of the difficulty and if it's "fun",...
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### Poor Dvorak (a limerick)

A famous composer named Dvorak Decided to open his door rack. But then Dvorak slipped, And suddenly tripped, Abe u.nn d.aeucpoy cbyr yd. unrrp pajtv The last line of the limerick is all ...
989 views

### A crypto-sequence puzzle

Your Japanese co-worker from this problem hands you another piece of paper one day: 1820143 2383341 3245353 8425463 6354607 6627972 9088779 7839589 ??????? ??????? What two seven-digit ...
334 views

### Hidden Message: Code and Calculation

There is a hidden message that can be decipher from the string below. Try to figure out what does it actually says. The final answer will be in text form. ...
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### BASE jumping from One World Trade Center

The well-known daredevil, Sauren Baumgartner, is standing on the top of One World Trade Center (in Lower Manhattan) just before sunset. Following his physical and mental preparation, he calmly drops ...
902 views

### You're the NSA, trying to decrypt a message between two friends

You're a secret agent working for the NSA and you have monitored the messages between two friends for a while now. Suddenly, their messages become encrypted and you're on high alert. The first part of ...
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### Help me learn to speak Susan's language

Susan was born with an extreme case of the rare communication disorder, "dyscryptia", which has enthralled neuroscientists and computer scientists alike from all 6 corners of the globe. She is one of ...
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### Name the Book / Movie / Show

What book / movie / show does the following refer to? &#x1f44d; {F52C090C-D3BE-48EA-AE49-6BCCF449A561}2.718 2 Winter Street
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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 ...
2k views

### Five puzzles in one!

This is an experiment of nested puzzles. The answer of each puzzle is necessary to solve the next one. Sometimes you have to manipulate it, sometimes you have to open your eyes (and mind). Run, to ...
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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 (...
415 views

### The Roman Crypto

This was found engraved into a stone in Roman times: And underneath, an inscription: eoofrddene·en.do·xfrtfscqqiiut·iucraeiuioceaarriocsrt·s·ieaei,imt·oesa·serism?·,· Even with only this minimal ...
672 views

### I am not Alien Then who am i?

Treat me baby who Abode of the good But don't think my origin is asteroid but believe me, i am not that alien I have traveled Millennium distances but that may not whistler in your ...
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### A coded conjuration from Ars Goetia

YE FYRSTE CONJOURATIOUN In the name of him who spake, I invoke and move thee, King Purson exalteth is the power of the Most High, I say unto thee, Obey! In the name of the mighty mercene of Apologia ...
588 views

### The Legacy of the Casino Owner - Code

So here's my first puzzle for you! A late casino owner leaves his descendants this letter: Dear my beloved sons Francis and Owen, dear my beloved wife Uma, The dice are rolled. You finally ...
725 views

### Where the hell is Vincent?

Vincent was a software engineer working at Bell Inc, and well...he's gone insane. He is said to suffer from clinical schizophrenia, autism and severe anxiety. But there's one golden fact about his ...