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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8
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3answers
722 views

Where will they strike?

You are part of an international anti-terror unit who has intelligence that some religious fanatics of the FSM church are going to soon blow a bomb in one or more of the world's major cities. You're ...
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1answer
184 views

What is the encryption algorithm used here? [closed]

Can you decipher what encryption algorithm has been used here. I have several examples but I cannot decipher the algorithm used. ...
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2answers
476 views

What is my friend trying to tell me?

My friend sent me the following short message: D57919749C3641B796384D0795DDE33739ED3E03 How should I decode it? Hint: Hint2: Hint 3:
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4answers
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The Twenty Doors! (ROOM 2)

This is part of The Twenty Doors series. The previous one is The Twenty Doors! (ROOM 1) The next one is The Twenty Doors! (ROOM 3) ROOM 2: After entering the first door, you find yourself in a ...
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3answers
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The Twenty Doors! (ROOM 1)

This is part of The Twenty Doors series. The next one is The Twenty Doors! (ROOM 2) You stand in a small, dark room. You have no idea where you are. Then, you see a message in front of you. ...
4
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1answer
864 views

What does Europe have in common with Timon and Pumbaa?

The answer is a five-letter English word, but "give me a hint" you might say. Unscramble the non-English text below, and you will be well on your way to solving this riddle. Just don't let ...
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3answers
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Help! I'm dying!

You are woken up to hearing your neighbour shouting - "HELP! HELP! I'M DYING!" You jump to your feet and run out into the street and see a man run away from your neighbours house, but he is too far ...
3
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2answers
651 views

The door of death!

You have been taken prisoner and thrown in a dungeon. You have escaped your cell, are standing in front of two identical doors. One will lead you to freedom, the other to a place where you will die a ...
10
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7answers
1k views

Become a billionaire!

The founder and owner of the company you work for has unexpectedly passed away, upon his death this email was sent to all employees: Hello All! Apparently I have kicked the bucket and have no ...
39
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3answers
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Lepidopterology needed!

This puzzle belongs to the puzzle series: hyper-modern art The two friends in the gallery of Hyper-modern art are still discussing. "You know what, to certain extent I start enjoying this Hyper-...
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4answers
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Decipher the location of the pirate treasure

Long ago, the pirate ship Wild Goose, led by Captain Oliver, sailed the coast of Nova Scotia. One night, according to legend, the Wild Goose was caught in a storm. Before she sank, Captain Oliver had ...
12
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3answers
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Music from the movies ♬ ♬

The following six audio samples represent, perhaps, the best-known classical music compositions as they have been used in more than 150 mainstream movies. This question asks you to identify the six ...
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3answers
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The pyramid code

One day, a colleague from the office hands you the following message without a comment and makes a quick retreat out of your cubicle. Can you make head & tails from this? What is your colleague ...
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2answers
1k views

The impossible door!

You are standing at the door to a lost temple in Georgia (the former Soviet Republic). You are an expert in lock picking, but there is no keyhole. You then realise that there is a word that will open ...
13
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2answers
644 views

Alex, Dave or Jeff

A man has plotted to blow up a building. The police have three suspects. They have received a letter telling the name of the suspect. But it is coded, to avoid one of the other members of the suspect'...
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3answers
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There's GOLD in dem der hills!

A pirate's treasure... Billy the pirate buried his plunder at the mouth of a large river. He killed all of his crew then made his way on foot back to civilization. He ended up getting sick with yellow ...
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2answers
898 views

Find the cipher algorithm and decode the message

Sam is a computer expert. He works in a Security Company. His son Tim just turned thirteen and is new to C++ programming and ciphertexts . He decides to write a C++ program to make a cipher algorithm. ...
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4answers
519 views

The mystery of the white witch

Harry Potter was happily living his married life when suddenly, he is told by Hagrid about people dying in sleep. So, he decides to set out on a quest to save everyone. He sets out on a journey to the ...
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1answer
782 views

Mathematicians Death Bed Password

A famous mathematician was found on his deathbed this evening, leaving behind his lifes work trapped away on his computer. Protected by a password, it is believed this computer contains many ...
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2answers
1k views

The mystery of the anonymous email

It is a bright Sunday afternoon. You are on a holiday, enjoying your cappuccino. Suddenly, you get a call from your boss at NSA. He tells you that a psycho-hacker has sent him and the whole staff a ...
7
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3answers
719 views

What's the password to the Golden Gate

You are out on a quest along with your pals, stumbling through the woods, sailing across the seven seas, when you finally reach a barren island with a skull cave. You stand at the mouth of the cave ...
17
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1answer
681 views

Chromatic Tones

An artist recently painted this odd looking mural in my hometown. He called it 'Chromatic Tones'. Most people just walk by it, but I suspect it has a deeper meaning. I have looked at it, increasingly ...
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2answers
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Messages of unknown origin

--storyline-- Recently, an ancient tomb of unknown origin was discovered during the deep-earth mining operations of 2035. Inside, there was a mysterious metallic box with engravings on each face, as ...
6
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1answer
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Decipher the crazy emails!

I've been trying to write some emails to my friends, but something is going horribly wrong! It's as though the devil himself has hold of me: everything I type comes out as gibberish! The first email I ...
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1answer
449 views

Stop the evil eye from glaring at me!

My sister gave me a message today: 13.8 4.8 3 10.8 3 11.4 7.8 15 0 0 0 0 1.8 9 9 6.6 5.4 3 She's glaring at me with an ...
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3answers
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What is the password to the diamond temple?

You are searching for the diamonds in a remote area. After hours, you see a temple with a diamond engraved. You realise that this is the diamond temple. The temple has the following also engraved: ...
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2answers
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Jack Sparrow and The quest for the missing Compass . Part 2

A short one this time around. Jack and his crew reach the top of Oholu's Heart. They look around and see a cave further away. Tired but determined, the crew marches ahead towards the cave. Just a ...
19
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4answers
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Escape The Strange, Code-Filled Cave

You awake in a weird cave with something strange written on the wall. You find a small piece of paper on a rock. It says the following: Solving each code and entering it into the password entering ...
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1answer
391 views

First Contact With Aliens

There is a strange meteor that is caught by the Earth's gravitational pull. No one even notices it because it is so small it will simply burn up in the atmosphere -- but it doesn't. Instead, it ...
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1answer
283 views

Quotes Surely. Cryptogram #5

Answers must include method of encryption along with plain text and explanation (explanation refers to thoughts or clues that made you think to do certain things). Cryptogram #5 cd, f, mq, ec, dq, ...
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1answer
487 views

Steganography. What is the decryption?

We were given an image that could be a barcode found hidden in it. However, I'm unable to read the barcode using an app after I re-created it and I'm unsure if I made an error or if it's an actual ...
32
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1answer
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Binary cryptogram from a friend

My friend sent me a "puzzle" in binary, and said that there are multiple steps to solving the puzzle, all of them including decryption. I translated the binary into text and he said that was a good ...
12
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1answer
698 views

Jack Sparrow and The quest for the missing Compass . Part 1

Hopefully this puzzle is not as easy as the last one. Jack Sparrow wakes up startled just when he was deep in slumber, after his night out with the "Ladies". He checks his pocket and finds it empty. ...
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1answer
201 views

Quotes surely. Cryptogram #2

Answers must include method of encryption along with plain text and explanation (explanation refers to thoughts or clues that made you think to do certain things). Cryptogram #2 kbemzkbedje de emz ...
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2answers
316 views

Quotes surely. Cryptogram #1

Cryptogram #1 Iq iycsc mqks gs wgqskowi gcieccq qqwocqi qqm agmccq siymocs, iyccc aysi sycckk gc sgaciyoqi ig gc sqom sgc q siymk eyowy mom qgi gcioq eoiy Pkiyqigcqs, qqm eokk qgi cqm eoiy Eoqsicoq,...
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2answers
3k views

Murder of a Cryptologist

Your friend, the Cryptologist Mr. Toboggan, has been murdered in his house. You being a detective and a Cryptologist yourself have been asked to lend a hand in solving the murder. You arrive at the ...
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2answers
530 views

Is this Cryptogram twist too much or too little?

I've added a twist to my normal cryptogram methods. I want to know if this twist makes the puzzle too difficult and, if so, how far back should I scale the efforts until the twist doesn't make it ...
3
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2answers
472 views

Where are the twinkies?

You have been stranded on an island in the middle of the ocean for the past 26 days, and your food supply is starting to run low. Unfortunately the only person on the island that has any knowledge ...
32
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1answer
2k views

What is leoll2 trying to tell us?

The following image appears on the profile page of leoll2: It appears to be a binary code, which I've transcribed as follows: (left-hand side) 01001110 01100001 01110100 01110101 01110010 ...
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2answers
875 views

A mysterious signal from space

It's late in the evening when your friend Mike, a brilliant astronomy student, points his radio telescope to Omega Centauri, a large globular cluster distant almost 16000 light-years from the Earth. ...
5
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2answers
483 views

Finally Returning Home From my Vacation!

Thanks for helping me get on my flight back home! Sorry I didn't elaborate on the extent of my travels, but I'm sure you can figure it out for yourself. :) Apart from the amazing view when leaving ...
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3answers
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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 ...
3
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3answers
519 views

Here's a little cryptogram I wrote, you might want to read it letter for letter

Mage's birth seems important. That's all I'm going to say. J EJPL QW VFIUQT UXWUTH YOSWSUV, HIU Q JQ PIAX PN HSV. BQIZ BQMKS R QBG WSU MGMTB, JRE IV E CQC ASWWK JV CLF PNEE QO M EW. R EN I KMU ...
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5answers
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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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1answer
1k views

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: ...
35
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2answers
2k views

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 ...
8
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1answer
437 views

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 ...
11
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1answer
646 views

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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2answers
309 views

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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1answer
333 views

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-...