Tuesday, April 2, 2019

cipher - Can you crack the Magic Diary's encrypted message?


Can you help find the hidden message in this encrypted text?


A young Science student / Stack-Exchange enthusiast stumbles upon a magical encrypted diary of a fellow he has always admired. He finds that the book reveals new secrets on blank pages each day about the encryption method used on the first page... can you solve the mystery???


Please note that there is an answer and the answer is written in plain English with all spaces delimiting actual words. Punctuation and numbers are not encrypted (if they are even included).


Words lengths 3,3,3,3,5,6,5,7,1,6,4,2,6,3,6,3,4,3,9,2,8.


Ciphertext:


Bpf qft lbv glz ixhve zqmoiw aqqow tunmzvd i uvjvuq liaj nc fonloc ook
yznbxf tei fgzy ynr ucfvngspr xn ccresriu.


Answers must include the method of encryption and the real text!


Bonus for figuring out who it relates to...


Hint 1#:



Frequent conclusions you will not, not here... Frequent use will not bring me a-loose.



Hint 2#:



Two sheets shroud the in mystery, every pair is Transposed with each other as a reference and then once all said and done the disk will help, maybe even the table? Either or. Don't thank me thank Trithemius.




Hint 3#:



I'm running out of hints to give but the word "Bpf" rhymes with 240 parts of one quid!



Hint 4#:



aTubal eRtca... This will definitely help you, if you know what I mean!



Hint 5#:




rTnapssotioin!!!
If your looking for a key you might be barking up the wrong tree...
as hint two is the closest thing you will see, maybe because there is no key.



Hint 6#:



I'm not your average T-R I focus more on horizontal movement then I should on vertical... But here is another version of the cipher text using a "traditional" T-R:



Ama req cmw nkw pcwiu lswyeu vfjlh mnwzoso l zaqehp wozc cp ohkmlb ptx

noaquq ctt yzil lyy xpocktlqo mw inapbeqh.

Hint 7#:



This might help!



Hints will be added, but for now I'm all hinted out!!


Any Questions I will be happy to consider as the next days hint!



Answer



Update (leaving some "thought process" in but removing dead-ends):



As another user answered, the plaintext is:



Any Man who can drive safely while kissing a pretty girl is simply not giving the kiss the attention it deserves.



Here's the explanation:



Clearly, there are two steps to this cipher. One is a transposition step, and the other is a Trithemius cipher. It is not clear in which order these steps were done to the plaintext, or how exactly the transposition step is meant to be done. The Trithemius cipher also may be done with a custom Tabula Recta of some kind ("more horizontal than vertical").



I believe the first word is:




"Any" because it rhymes with "penny"



Hint 2 helped:



Hint 2 says "as a reference," so what if the transposition was in the rows of the Tabula Recta instead of the letters themselves?



So



I made a tabula recta with the heading letters transposed




B A D C F E H G J I L K N M P O R Q T S V U X W Z Y
A A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
B B C D E F G H I J K L M N O P Q R S T U V W X Y Z A
C C D E F G H I J K L M N O P Q R S T U V W X Y Z A B
...

which initially didn't look promising, but:



After reading hint 6, I tried shifting in each row in various extra amounts AND transposing the top keys:




B A D C F E H G J I L K N M P O R Q T S V U X W Z Y
A A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
B D E F G H I J K L M N O P Q R S T U V W X Y Z A B C
C G H I J K L M N O P Q R S T U V W X Y Z A B C D E F
D J K L M N O P Q R S T U V W X Y Z A B C D E F G H I
E M N O P Q R S T U V W X Y Z A B C D E F G H I J K L
F P Q R S T U V W X Y Z A B C D E F G H I J K L M N O
...

In which case "ANY" would indeed be encoded as "BPF" but to get "QFT" the plaintext would need to be "GSF" which doesn't seem to be a word.


Looks like someone beat me to the decoded phrase, but here's what I got by the time I saw it was solved:


I went back and checked out the "ama" version of the ciphertext, and found a pattern of shifts that made reasonable-sounding words. The TR ended up looking like this (number on the left is which line it would be on in a normally-ordered TR):



   B A D C F E H G J I L K N M P O R Q T S V U X W Z Y 
1 Z A B C D E F G H I J K L M N O P Q R S T U V W X Y
2 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
3 B C D E F G H I J K L M N O P Q R S T U V W X Y Z A
6 E F G H I J K L M N O P Q R S T U V W X Y Z A B C D
5 D E F G H I J K L M N O P Q R S T U V W X Y Z A B C
6 E F G H I J K L M N O P Q R S T U V W X Y Z A B C D

7 F G H I J K L M N O P Q R S T U V W X Y Z A B C D E
8 G H I J K L M N O P Q R S T U V W X Y Z A B C D E F
9 H I J K L M N O P Q R S T U V W X Y Z A B C D E F G
12 K L M N O P Q R S T U V W X Y Z A B C D E F G H I J
11 J K L M N O P Q R S T U V W X Y Z A B C D E F G H I
12 K L M N O P Q R S T U V W X Y Z A B C D E F G H I J
15 N O P Q R S T U V W X Y Z A B C D E F G H I J K L M
14 M N O P Q R S T U V W X Y Z A B C D E F G H I J K L
15 N O P Q R S T U V W X Y Z A B C D E F G H I J K L M
16 O P Q R S T U V W X Y Z A B C D E F G H I J K L M N

17 P Q R S T U V W X Y Z A B C D E F G H I J K L M N O
20 S T U V W X Y Z A B C D E F G H I J K L M N O P Q R
19 R S T U V W X Y Z A B C D E F G H I J K L M N O P Q
20 S T U V W X Y Z A B C D E F G H I J K L M N O P Q R
21 T U V W X Y Z A B C D E F G H I J K L M N O P Q R S
22 U V W X Y Z A B C D E F G H I J K L M N O P Q R S T
23 V W X Y Z A B C D E F G H I J K L M N O P Q R S T U

Also note that the last line is shifted to the top, and then there is a pattern where certain lines are skipped, the next lines are out of order.




It appears the left-hand side of the TR was also transposed.



Using this table to decode "Ama req cmw nkw pcwiu lswyeu" I got:



"Any man who can drive safely"



And so on...


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