All Questions
Tagged with cipher computer-puzzle
73
questions
40
votes
4
answers
4k
views
Multilayer Image Steganography
Alice, Bob, Carol, and Dan are playing a card game. After they all show their cards, Bob notes that by exchanging two cards the order of the players would be reversed; that is, the player with the ...
- 18.9k
32
votes
3
answers
9k
views
▉ ▎▊ ▐▎ ▋█ ▐▉ ▋█ ▐▉ ▎▊ ▐▎ ▎█ ▐
(I created this puzzle myself)
I was shopping for groceries the other day, and I found an item that was in an unlabeled, uncolored package. In fact, the only thing that was on it was this barcode:
...
31
votes
5
answers
2k
views
The old tinkerer's safe
A client of mine died last Sunday - just as he was born on a Sunday. He was already at rather ripe age, and I had the pleasure to present his last will to his loving and caring family. As far as I ...
- 18.2k
31
votes
3
answers
10k
views
What secret is this massive technical puzzle hiding? [riddles and data puzzles]
There's a game development company which released a mysterious "countdown to reveal" web page, and the page is designed pretty fancy, so everyone in that gaming community is curious about this.
This ...
- 263
27
votes
8
answers
2k
views
Meatsacks, please help us decipher this code
Be greeted, meatsacks. We have been studying several of your species for some time now. One of the subjects, some meatsack related to saving Earth several times, seemed to know a lot of our operations ...
- 720
25
votes
3
answers
1k
views
A weird website
So I recently stumbled upon a very strange website:
There doesn't seem to be anything except a normal navigation-bar (which isn't working) and a cipher. Can you decrypt it? Maybe the plaintext will ...
user14478
22
votes
3
answers
2k
views
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 ...
- 17.5k
21
votes
2
answers
3k
views
What is this mysterious image?
Recently, my friend who lives in Italy sent me an email. This was its contents:
Hi,
I've got some news which you should be happy about. But I've seen you around on Puzzling.SE, so I though I'd ...
user21703
20
votes
1
answer
819
views
Old code for the new year
Here is a question I posted on rec.puzzles back in 1998. So it's about twenty years on, and people seem to have stopped thinking about it. I'll refresh your memory by posting it again:
I wrote a ...
- 4,208
17
votes
2
answers
434
views
The Empty Cube (Interactive Puzzle)
I've made an interactive 3D cube puzzle in CSS, The puzzle is fully solvable from the images below, but the fully interactive version is here: https://codepen.io/chengarda/full/RwyKvwz
The empty cube ...
- 3,646
15
votes
4
answers
1k
views
Don't Be Afraid Of The Dark
This puzzle follows the convention that anything outside a quote is flavour text.
So last night I left my computer running. You know - when computers get older they want to bend the rules a bit. Don't ...
- 720
15
votes
1
answer
1k
views
Decipher the clues, escape the prison!
Decipher the clues, escape the prison!
The guard at the prison, where you have been locked up for misuse of USB ports, has given you one chance to escape, by typing in a certain word. A keyboard is ...
- 783
14
votes
5
answers
617
views
To each his own
You are a graduate student in theoretical mathematics, dabbling every so often in some interesting but equally useless computer science theory. From the beginning of the year, Professor Carl Hayden ...
12
votes
2
answers
1k
views
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 ...
- 17k
12
votes
2
answers
1k
views
Help! What's my encoding? ¡×ךwg¿¿uþ}0ã×/Œz0îÏ–þžwóuÜ„
I wanted to share a wonderful message with all of you lovely people on puzzling.SE, but when I typed it in, all that came out was a string of gibberish:
¡×ךwg¿¿uþ}0ã×/Œz0îÏ–þžwóuÜ„
Thankfully I've ...
- 370