Username: 
Password: 
Restrict session to IP 

What is this about?  Go to the Training: Crypto - Digraphs challenge

Global Rank: 174
Totalscore: 107276
Posts: 14
Thanks: 15
UpVotes: 13
Registered: 10y 315d



Last Seen: 51d 23h
The User is Offline
What is this about?
Google/translate1Thank You!2Good Post!0Bad Post! link
Hi guys!

My question is what this crypto is about? So how does it work? I tried to understand it by studying the source code of JPK but I didn't get it.
Global Rank: 239
Totalscore: 85888
Posts: 1434
Thanks: 1257
UpVotes: 777
Registered: 13y 220d




Last Seen: 9h 13m
The User is Offline
RE: What is this about?
Google/translate2Thank You!1Good Post!0Bad Post! link
The challenge is about digraphs, of course.
Roughly explained, a digraph means two symbols are resulting in the same one(or more?) letter(s).
If i recall correctly you can use JPK ascii->digraph function to convert 2 characters into 1.
JPK is not needed for any challenge here, but sometimes it can help you a bit Smile

Good luck!

Edit:

After you did the conversion, you are left with a simple substution cipher.


Edit2: I am not sure if my roughly explaination is 100% correct. At least you can say that you should work on the plaintext grouped in pairs. Another example of a digraph cipher may be Playfair. But not sure on that either.
The geeks shall inherit the properties and methods of object earth.
Last edited by Gizmore - Jan 18, 2011 - 18:41:59
Global Rank: 202
Totalscore: 95644
Posts: 11
Thanks: 7
UpVotes: 8
Registered: 6y 17d




The User is Offline
RE: What is this about?
Google/translate0Thank You!0Good Post!0Bad Post! link
I am stuck in this challenge Sad

I can decrypt part of the hidden message manually but i can´t know the keywords.
The problem here is the chiphertext changing everytime in the challenge but the message still the same, and another problem is the case sensitive and the punctuation.
Its very frustating Sad

Thanks anyway for this challenge!
Global Rank: 1
Totalscore: 763401
Posts: 419
Thanks: 472
UpVotes: 430
Registered: 12y 58d












The User is Offline
RE: What is this about?
Google/translate0Thank You!0Good Post!0Bad Post! link
Not sure why the things you mention should be a problem. If you decrypted the message, the keyword should be clear. Perhaps the problem is that you are expecting an actual English word instead of some random string?
Global Rank: 202
Totalscore: 95644
Posts: 11
Thanks: 7
UpVotes: 8
Registered: 6y 17d




The User is Offline
RE: What is this about?
Google/translate0Thank You!0Good Post!0Bad Post! link
Thanks for the answer, maybe i not explaing very well.
I try to understand how is encrypted the message, i try to separate the message in two pair of characters, every pair give me a letter and a guide to desencrypt all the message, but i dont have the 100 % of the message.
I dont know if the digraphs are made with a mixed alphabet with two keywords to complete the grid.
Global Rank: 1
Totalscore: 763401
Posts: 419
Thanks: 472
UpVotes: 430
Registered: 12y 58d












The User is Offline
RE: What is this about?
Google/translate1Thank You!1Good Post!0Bad Post! link
You said you have decrypted part of the message. If so, then you should know enough.

All you really need to know is that what you are given is enough to decrypt the message, as many have demonstrated before you.
Global Rank: 202
Totalscore: 95644
Posts: 11
Thanks: 7
UpVotes: 8
Registered: 6y 17d




The User is Offline
RE: What is this about?
Google/translate1Thank You!1Good Post!0Bad Post! link
Thanks for your time, I try too much harder
CHItA, Redknee, tunelko, silenttrack, n0tHappy, TheHiveMind, Z, balicocat, Ge0, samuraiblanco, arraez, jcquinterov, hophuocthinh, alfamen2, burhanudinn123, Ben_Dover, stephanduran89, braddie0 have subscribed to this thread and receive emails on new posts.
1 people are watching the thread at the moment.
This thread has been viewed 71503 times.