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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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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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5answers
926 views

What is the code?

You have a digital safe you need to unlock, but you forgot the 5 digit code. Luckily, your friend, Ben Dover knows what the code is. But he won't just tell you, he gave you a single clue to start off ...
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2answers
143 views

Ready every count until raspy seers inure oaths noble

Entry into Fortnightly Topic Challenge #38: Reusing Information 1 I'm hoping this fits into this. Right is a just cause, or a just cause is right. Every day should be happy, or happiness should ...
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1answer
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A Puzzle Consisting Entirely of Reused Information

In the spirit of A Puzzle Consisting Entirely of Random Anagrams, I decided to make my own puzzle. informatiinformainformatinfinforminfoininininformationinformainformatiinformat ...
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2answers
105 views

A hidden puzzle link

I have left you a line to a puzzle below this sentence: WKLVLVDUHGKHUULQJORO So? What are you waiting for, go! Hint: Second Hint:
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2answers
165 views

The riddle of no sense

Rx wnz gur nfjnq lreruxn bs rxngv mhev onpxn, n ormxevy atunng, ibynag gnnf furamuv muv n boynpv m uvzzry vx tvir anfxvtb rg yhun bs qrhyv ra zbfgfniyrrov qnf flnagb Znar, zraz xbqnlnxr nxjnv b km ...
11
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4answers
474 views

Unlooted Invasion

I suspect someone broke into my house last night. Nothing was stolen of course, I would have went to the police otherwise. The reason for my suspicion is a note that I found just beside the door. ...
5
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1answer
130 views

Looking for a message

I'm looking for a secret message found using these two clues: 181-5 253-14 294-7 298-6 382-11 384-2 59-9 480-1 510-10 541-13
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1answer
100 views

You'll be stuck in this maze, forever (Cubic Cipher)!

Okay, so I mentioned in another puzzle that I created a new kind of cipher, which I refer to as a Cubic Cipher, now that the way to solve it has been established, it's time to ramp things up. As ...
3
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1answer
81 views

A prisoner's cipher enclosed within an email

An associate of mine was recently arrested and is being detained in a prison in Ohio until his trial in a couple of weeks. He and I need to be able to communicate some, ummm, compromising information ...
11
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2answers
405 views

Tricky Riddle, Wordplay heavy, What is my name?

Today, I have what I consider a tricky riddle for you to answer. Please note, I have added the correct tags to this riddle. I have some math problems that I need help solving. Do you think you'd be ...
7
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2answers
401 views

Looking for a word

I'm looking for a word. Use all the skills listed on the tags. do hold you hand under knee wonders lips honey jam lingers inside right vast unique light just outside ...
6
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1answer
280 views

Find the hidden message!

I posed a similar challenge to someone and it appeared to be sufficiently hard that I'll post it here. Sooo... Find the hidden message! ...
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1answer
150 views

What am I cooking up today?

Today, I decided to cook something that, if it cooks correctly, should turn out pretty cool. Below are a series of riddles and ciphers that list the ingredients for what I am cooking. Can you figure ...
10
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2answers
175 views

A new kind of cipher?

So, I believe that I may have created a new kind of cipher, would you be able to solve it? (I'll let you know what I've decided to name it once you've solved it :) ) ...
9
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1answer
319 views

First Cryptography Puzzle

When adam and eve sinned, apple was the key. Lies of the Serpent, they both believed. Alternate: 56 108 87 97 119 53 97 43 57 49 68 105 66 51 121 115 84 54 120 51 81 65 61 61 I'm looking for just ...
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1answer
49 views

The Star Spangled Shifter and his coded messages

I got a strange email today. I tried running this through every decipher I knew of, but I couldn't figure this out. Can you help me figure out what this mysterious figure wants? from: ...
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2answers
131 views

The Trail of Clues: The Mystery island

<--- Previous and first clue You are standing on a roof in Israel at the top of the Ladder. You notice that there is a small package taped to the top rung of the ladder. You pick it up and take it ...
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0answers
221 views

Coloured dot cipher

I, as a curious being, stumbled upon a page which had a hidden dot cipher in it. Part of the console states: [...] we left you a little message in the dots of the footer (Source: segment.com) The ...
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1answer
186 views

The answer is Caesar. What is the question?

VNUGPEUISLOGTDTQPEGEXUCTSPGHEUDUK? ...
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1answer
63 views

A Kidnapped Friend

One friend of mine has been inactive over the past few weeks. One day, my friend sent me this: Hello there, I have been kidnapped! I secretly made this message in order to get you here. Here is ...
14
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1answer
609 views

What's the passcode?

One morning, as you wake up, you feel something on your face: It's a letter. As you take it off your face to read it, You fall off your bed. Uurrrgh, you say and stand up. The letter says: ...
2
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0answers
184 views

Definitely not suspicious

This unsuspicious ... post - has just a bunch of random letters. No secret words, no silly ciphers, nothing. Nothing to see here. Goodbye. Urgent secret message: Go to another question ahem, what ...
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2answers
153 views

Encoded text message

I've revived the above texts from my friend simply called "me". Apparently the text messages tell you everything you need to know. Arrrrrrgh! I told him not to mess with people. Hint 1:
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1answer
168 views

Look inside to answer this [closed]

Qwb'kr kkuau; ekx kbwq . I'll say that what is important is not what you read. Hint 1: Hint 2: Hint 3: Answer to prove the hold reason wrong:
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1answer
317 views

Decrypting a Cesar Cipher puzzle from a hex

I have the following hex to ascii conversion: 70656c636762207a726e61662070656c636762207a726e = pelcgb zrnaf pelcgb zrn Applied with ROT13 I get: crypto means crypto mea I'm also provided with the ...
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1answer
118 views

Where did my Professor GO?

You wake up on Monday, realizing you're late to meet with your professor. You put on your hat and hurry down the stairs. Just as you're about to leave, your mom gives you an earful (unfortunately, you ...
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2answers
114 views

The cipher puzzle

One day, I found this crumpled up note. It said: ...
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1answer
82 views

Find the hidden dialogue

26535-34825-69399-78164-50288 59230-26433 70679-41971-14159-78164-06286-34211 Hint 1: Hint 2:
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3answers
305 views

Bird is NOT the word!

I can't get into my computer. It's password protected, you see, and I got hit by a cement truck this morning in front of the Compound Word Store. Luckily, I have this nifty cheat sheet. It was ...
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2answers
8k views

My Spying Girlfriend

I need your help again. My girlfriend Ada now has a job at a spy agency and there's a... situation. Ada's boss called her into his office this morning. He was holding a weird tube with a button in ...
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1answer
69 views

Seeking Fortunes

Great uncle Joe passed away apparently without a will. However, one of his distant relatives got a note from him. He said that all of his relatives have to get a chance to decode it. Here is the note. ...
5
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2answers
114 views

Car Return Problem

Dave planned a party for his new company. Hundreds of people were invited and he knew that car parking would be a problem. To make it easier, the staff were to park the cars by brand and size. On ...
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1answer
178 views

Cannibal puzzle

You wake up in a dungeon. You see some small letters on the walls. They spell: You must get out of here. I have given you a simple puzzle. Here is a code: rw nxu mca ldpmhf "j uium um mhm b fctto". ...
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4answers
391 views

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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1answer
61 views

Wordplay Puzzle

So, as I was flipping through my papers from school, I realized I made an unscramble puzzle for my friends. I was interested if anyone could solve these words with a hard twist. Every scrambled word ...
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6answers
1k views

50th Puzzle Landmark: My exciting exploits with Adedayo, Prince of Nigeria

Today marks a very exciting day for me. Today will be my 50th puzzle on this site, and as such, I've created a challenge the likes of which I have never done before. I hope it to be my most ...
4
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2answers
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Help my dear Friend!

My friend has been Kidnapped! You must find him at a location. The kiddnapper gave me a hint: iuay hyptqg pf du ukt sxdcd qi, qi Please help him!
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3answers
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What's the secret text?

Poem: The sequence leads you there The "shift" is not that rare It is ancient, you will see Jupiter is the key 14 15 92 65 35 89 79 ?? OGSULLOIOGRREYSGXZ Hint Big Hint
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1answer
275 views

Base what? Oh, great, now I need magic

This cipher's too hard to solve by itself. This short riddle provides sufficient help. You must consult the fifth man; He'll lend a hand, And less information quite appropriate. <...
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3answers
2k views

Where is my 25 reputation?

You, Detective Ryan, are packing up, as you are retiring. You have to say goodbye to your best friend, Wudriwurds. You open his last letter that he gave you, and read it with all your heart. Dear ...
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2answers
153 views

logical deduction - A Cipher with Numbers

44339994666666455533 Can you solve this cipher? I know the repetition of numbers holds some significance, but can't really put a finger on how exactly. Any help will be appreciated.
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2answers
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an enigma i can't solve, could you please help me solve it

Xnt vhkk rshk rghmhmf dudm vgdm hs fdsr czgj could you please help me crack this enigma, someone sent it to me a few days ago and i can't stop thinking about it
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0answers
148 views

Decoding ciphertext with base64 yields obscure unicode

Context: I was given a piece of encrypted string to decipher and I have been stuck at it for a while. To not ruin the point of the problem, I will provide only some description of the text and my ...
6
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1answer
381 views

That is a battlefield

These emails keep coming, and I can't block them. Apparently my ISP has told me that they're too secure to end up on my block list, and for some reason, I can't send these messages to spam. Whoever ...
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1answer
409 views

A lad named E. Mandala

In a follow up from yesterday, I was sent another email from the same source. The tile of the message was, "A lad named E. Mandala" which I've set the title of this puzzle to. Can you help me make ...
3
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1answer
86 views

What is the code in the following sequence of numbers?

6-1, 9-3|4-1,6-3 2-1,5-3| 4-3.6-2|2-1,6-1,3-2,7-3,4-3,2-3,2-1| 6-1,3-2,2-1,6-2,8-1|6-1,9-3|3-1,6-3,6-3,6-1| The above sequence is a code which leads to a riddle. Please help me crack it.
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1answer
308 views

What I Learned from the Attic

Now that I have moved into my parent's house for a temporary stay, it was time for me to earn my keep. My father has become quite old, and time has not been kind. There is a lot of unused and ...
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0answers
280 views

Trying to de-code this and I'm having a lot of trouble

The code is: dsetg nvxgn abfus fcaur vvkyq llszs yybik pkefa vbyjj stalk aupoc dvyai qnlrj iewzb qfcct mgqrg xxuqy sapeb reahl btxbz wisfd klbqr letxa zhu I've run it through a bunch of ciphers ...