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.

Filter by
Sorted by
Tagged with
3
votes
1answer
189 views

A picture of Gaspard Monge

In Paris, a famous Nobel prize winner was found murdered in his kitchen. The door of the refrigerator stood wide open, and a small piece of butter had fallen on the floor. On the kitchen table, there ...
10
votes
4answers
871 views

Happy Math Question

Solve the following morning math problems to solve the Math Message: $7 \times (60 + 103)$ $219 \times 2 \times 3$ $2 \times 3 \times 10^2$ $\sqrt{40000}$ $23 \times 5 $ $16^2 + 26$ $\frac{1000}{2} - ...
27
votes
8answers
2k views

Safe combination for your heritage

Phillip, a 68 years old man, was near the end of his life. Before passing away, he decided to hand to his daughter a piece of paper with the following: ...
5
votes
1answer
275 views

Scrambled Songs 2: What is the song this time?

Yeah... this is the sequel to Scrambled Songs which is here. This is to redeem myself from that really easy question: Another scrambled song... 3684-4009-4010-4840-3756-4876-4262-3755-4279 A hint ...
5
votes
1answer
428 views

The Art of Misdirection

You're part of a special intelligence operation trying to predict the location of the next strike for a notorious terrorist group. This group has proven that they are willing to kill innocent people ...
40
votes
3answers
4k views

What is the title of this modern art painting, if not “Stars and Stripes”?

This puzzle belongs to the puzzle series: hyper-modern art Still in the hyper-modern art gallery... "You know, even now that you have explained to me, how hyper-modern-art works, I still don't quite ...
45
votes
5answers
6k views

What does this modern art picture represent?

This puzzle belongs to the puzzle series: hyper-modern art Two visitors are standing in front of a painting in the hyper-modern art gallery, discussing it. "Well, I have to admit that I really don't ...
-3
votes
1answer
683 views

Solve this Encoded Text!

I wonder if you'll be able to reverse this set of words, but first you may want to get a bit shifty! iLppk scyc, wys ihmgltvihi xm! vKein xfs :H I have given you all the information you need to ...
1
vote
1answer
165 views

Caesar would be pleased

U PROP BY THERE, USE PARS PAR THERE PROP BY THERE IYBSM PAR YUCR THER, USE YH HS. THINE BP AUQQRS PAUP PAR HGBMBSUN PROP BY GRUTARE UP YHCR YPUMR?
9
votes
1answer
1k views

Justice and Fairness: Part 2

A friend of yours was part of a secret society and was put on trial on 15 December 2014 without a lawyer. Alice encrypted the trial's transcript and sent it to Bob, but double agent Carol was able to ...
12
votes
1answer
1k views

Heliocentricity

They approached the man apprehensively. He was aware of their approach, but did not turn to face them. Instead, he kept looking through the window toward the stars. Finally, one of the men gathered ...
15
votes
1answer
1k views

A Curious Recipe

Little Red Riding Hood received this odd recipe from her grandmother. Hello. Here's a cake recipe you might enjoy! Orange cake: (serves 4) Ingredients: - 111 cups caster sugar - ...
4
votes
4answers
357 views

Dr. Strangelove or How I Learned to Stop Worrying and Love the Bomb

Can you recover the following two dozens of (well-known) movie titles just from their initials? ...
1
vote
2answers
559 views

Cipher with a hidden key

The challenge is to decode this cipher: TJ KS JX AP GN DT DG FE ER EU UA HJ The key is attached to this question. Try to find it!
2
votes
1answer
488 views

Mission: Impossible 1

Ethan Hunt is alerted by the IMF. They want him to intercept a courier that is working for the super villains Matt Fillimore and Caro Bassanara. Ethan Hunt receives the following cipher from the IMF: ...
3
votes
1answer
236 views

Our Honor is Unstained

Here are four photos from Google satellite maps and one from Wikipedia (see note 1). These photos show a family related by strength and endurance. The goal of this puzzle is: to identify the ...
21
votes
1answer
500 views

The Dots of Creation

Along the road less traveled, an abandoned temple lays in ruins. Though it has suffered the wrath of time, its foundation remains strong. And within this place, an inscription remains visible. A ...
-4
votes
1answer
333 views

find a word in this text [closed]

I have two "messages": 596f752061726520616c6d6f7374207468657265203b29 aHR0cDovLzE5My4xNDIuMTEyLjIyMDo5MC9tYWluX3Rhc2sucGRm They have a hidden password, and I don't know exactly which one could have ...
11
votes
3answers
3k views

Please help with this geocaching puzzle

Edit: added link for geocheck I have been working on trying to solve this puzzle for months and cannot come up with any solution. I have learned lots of puzzle solving methods in the process but I ...
-5
votes
1answer
287 views

Looks like ECB — What story is this?

Secrets Revisited A friend sent me the following and wanted to find out if anyone could figure it out. The message was encrypted three times, and all keys and primers were provided. It appears that ...
5
votes
1answer
845 views

Who's the next target?

Kenny's a serial killer and he likes to play games. To make his killing spree more interesting, he leaves clues for the detectives on his next victim. One day, the police station received a message as ...
7
votes
1answer
806 views

Mousehunt cryptogram

I found this puzzle within the game Mousehunt It didn't seem to match any rune system that I know of. Rotating the image also didn't seem to show any useful information, although the first word when ...
5
votes
1answer
436 views

The Inspector and the Hit man

Inspector Crumblesniff thinks he is on the verge of arresting a notorious Mafia hit man, but he needs your help. First, after a raid on Sal's Pizzeria, he found an address book with these contents: ...
18
votes
2answers
1k views

One word: Bacon

Decrypt the hidden meaning in the picture below: Hint 1: Hint 2:
17
votes
7answers
2k views

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 ...
0
votes
1answer
400 views

I need help on finding out what this means. I know there are 4 steps to it.

The driven ambitious with passionate zeal, Will step forward to discover the author’s reveal, With princes by men, In columns of ten, the experience the answer shall seal. QBOKD KWLSDSYX SC DRO ...
15
votes
2answers
1k views

The billionaire's necklace

One day, the old billionaire summons his relatives in his study: "I'm very sick and may die soon, but the thought of all of you waiting for my death just to inherit the money makes me even sicker. ...
3
votes
2answers
676 views

Where am I located?

Note: Not a true story I am currently bored while idly thinking about how I got this job in VA. Sitting at a desk, I think about my work conditions while playing around on Inkscape. Below is the ...
26
votes
1answer
3k views

Find the secret message

The word under secret means something. What does it mean? (Find the secret message.)
29
votes
3answers
2k views

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. ...
6
votes
1answer
1k views

A riddle and a line of text

I have a bit of pseudocode for you, and then an encoded string. The pseudocode will help you untangle the string. It's not the most easily understood pseudocode, and that might (just might) make your ...
4
votes
1answer
1k views

A binary puzzle from 1950

I got this puzzle from my grandpa who was developing a cipher system; this is his first creation and his first example. He doesn't remember the plaintext, so I want to crack it, but I suck so I leave ...
3
votes
1answer
6k views

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?
2
votes
1answer
525 views

Place names in movie titles - stumped on this puzzle

I'm working on this puzzle where the solution is either a word or phrase with no theme. The first part of the puzzle had incorrect movie titles with cities, states, etc, and the solution to the ...
25
votes
2answers
2k views

Known Algorithm Attack: Caesar Reloaded

Most of the puzzles here revolve around an unknown algorithm attack. That is, you are given an enciphered piece of text and asked to decode it (and often given a series of hints which describe how the ...
22
votes
1answer
2k views

Can you decipher the hidden message in this Christmas card image?

Sent by a friend in Germany. I have no idea what it says yet!...
11
votes
3answers
1k views

Christmas Day Cryptogram / Riddle

This is a cryptogram puzzle, with some riddle-style clues to help you solve it. When you find the thing that links all of the clues, that will let you deduce the keys to decipher the cryptogram. Here ...
12
votes
2answers
642 views

Descramble the scrambled text

I did something funny. I took a simple phrase. HELLO, WORLD! I generated all rotations of the string. ...
8
votes
4answers
2k views

A geometric transposition cipher

This is my first cipher puzzle. Here is the ciphertext: ...
4
votes
1answer
227 views

Not your regular Caesar Cipher$\ldots$

What in the name of the USSR does this mean?! 59 103 106 138 -1 106 138 -1 81 -1 135 81 141 103 94 135 -1 106 122 141 94 135 94 138 141 106 122 100 -1 87 125 91 94 -2 -1 91 125 122 -3 141 -1 157 ...
13
votes
1answer
990 views

What does this piece of text say? '''op I se ,+Ja^u!, noh jo huew moy''' '+)adxa I 'sno!^qo

'''op I se ,+Ja^u!, noh jo huew moy''' '+)adxa I 'sno!^qo
9
votes
4answers
3k views

Justice and Fairness: Part 1 [closed]

A friend of yours was part of a secret society and was put on trial on 15 December 2014 without a lawyer. Alice encrypted the trial's transcript and sent it to Bob, but double agent Carol was able to ...
4
votes
2answers
323 views

From $b$ to $a$, and then $a$ to $b$, come find me!

$\mathfrak{From\>}b\>\mathfrak{to\>}a,\mathfrak{and\>then\>}a\>\mathfrak{to\>}b,\mathfrak{come\>find\>me!}$ ...
22
votes
6answers
2k views

The Hunting of the Snark: Given ciphertext and plaintext, what cipher is used?

This is a cryptogram puzzle. Below is some text; each section of the original text ('plaintext') is followed by an encoded version of that text (the 'ciphertext'). Your challenge is to explain the ...
13
votes
2answers
2k views

Secret “Language”?

One of my friends gave me a phrase in a 'secret language' to try and solve. This is very urgent as if I solve it, I get a rather great reward. Here is the phrase: Hu, E fuh'd. E tu hud fecr du ...
9
votes
2answers
732 views

The strength of ciphers against brute force methods - what makes it more difficult but keeps it fair for humans?

EDIT: We have a couple of cipher puzzles on this site which use primitive, simple ciphers like Caesar, Bacon and substitution ciphers, and some of these puzzles combine them. This made me wonder ...
35
votes
4answers
2k views

Break the subsitution cipher with a twist

Breaking news: the NSA can break letter substitution ciphers. (Letter frequency, guessing the word "the", et cetera...) So, let's make our secret code more secure. Let's apply the secret substitution $...
7
votes
3answers
1k views

Murder of the President - Part 6

This is Part 6 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 - ...