Unanswered Questions
109 questions with no upvoted or accepted answers
45
votes
1answer
4k views
Unsolved Mysteries: D'Agapeyeff cipher
The D'Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of "Codes and Ciphers", an elementary book on cryptography published by the cryptographer Alexander D'Agapeyeff in ...
25
votes
0answers
3k views
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 ...
20
votes
0answers
1k views
One 'double agent' two-step on a waltzing floor
I'm in a jam – cornered I am! –
No clue 'bout where to go
Here's what went down, a pretty gown
Some wine, a French chateau
She whispered underneath her breath
"Come dance with me and ...
16
votes
0answers
5k views
The Beale Papers
The background to this one's given here: http://www.damninteresting.com/89-263-201-500-337-480/
NB: These may not be a genuine cryptograms (current thinking is that these are gibberish); but I though ...
15
votes
0answers
810 views
BFTIODFTTWKBCSC
This is my first self-developed cryptographic puzzle. I hope it is neither too hard nor too easy for you to break, and that you enjoy it. Please do not only post the answer, but also your way towards ...
14
votes
0answers
944 views
Deus Ex crypto puzzle
There is an encrypted email in the recent Deus Ex: Mankind Divided game:
From the game files, this appears to be the string:
...
13
votes
0answers
1k views
Is there a more efficient way to rotate the centre pieces on the Octo-Star?
I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees.
The situation below occurs when four properly-oriented edges are next to each other, ...
12
votes
1answer
609 views
Creepy video on Youtube, with secret cipher built in
This showed up in r/deepintoyoutube:
https://www.youtube.com/watch?v=j1ExfbH4Jew
I've posted it around, and no one has solved it. I believe it is a cipher for a couple of reasons, at the end 26 ...
10
votes
0answers
393 views
Alternate, complex potions puzzle from HP fanfic
A long narrow room. The entrance is blocked by purple flame, the path onward blocked by black flame. On a table, the only thing in the room, are two dozen potions in opaque bottles. Half green glass, ...
9
votes
0answers
250 views
Bongard Metapuzzle
An entry in Fortnightly Topic Challenge #38: Reusing Information 1
A Bongard Problem is a problem where you have 6 symbols on either side of a line. The symbols on the left follow a certain rule, ...
9
votes
0answers
544 views
Hundreds of thousands of words contained in such a small package
If you find that you are crafty you will see the answer's: ___________
CfAaEuDbLcIuHk
DbBaAbEbAiEfIa
JaCaEaIcIcEfIa
JaCaAaEfAaEfIa
BcJkAaEfAaEfIa
EbIkAuEfAaEfIa
EbIkAbEfAaEfIa
DfAqEaEfAaEfIa
...
9
votes
0answers
873 views
8
votes
0answers
129 views
Who am I? A puzzle in parts
I am one of four brothers, we make a foundation
in some way we are native to every nation
if one is kind, the other is not
if one is a little the other is a lot
from what you give i will take
only 1 ...
8
votes
0answers
203 views
Determining the meaning of a challenge coin
I saw this rather cool looking challenge coin the other day, and I was wondering what the associated binary on the back of it means, as it isn't standard ASCII. I'd appreciate it if you all have any ...
8
votes
0answers
1k views
REALLY important days in history
@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005.
My puzzle asks the question: What is the previous date in ...
