hackthissite.org basic 6 :: encryption system
by Arxleol on Friday 26.06.2009, under hackthissite.org, tutorial
In the following mission we will try to decrypt Sam’s password. We have obtained encrypted password and encrypter therefore therefore we ought to have all we need to decrypt the string obtained.
Mission begins with the following introduction:
An encryption system has been set up, which uses an unknown algorithm to change the text given. Requirements: Persistence, some general cryptography knowledge.
Here is string I got for mission:
8g6f;k>m
Now we have to figure out encryption algorithm. So let’s begin checking encryption. When I enter empty string I get “ so I decided to enter aaa and then I obtained abc. This got me on right track. So I tried to enter 111 and I obtained 123 this is enough to figure that algorithm works in following way using ASCII table to increase character for the position it is on.
Let me explain, if a is on second place we get b if a is on third position we get c and so on. The same is with numbers.
So let’s decrypt string above:
8f4c7f8f
I hope this helps.
Tuesday 01.09.2009 on 17:22
This wasn’t very helpful at all. I learned nothing from this tutorial so far, maybe users can help me out..
AAA – ABC does not fully explain the algorithm or how to decrypt different strings. Forgive me if I am wrong but
69dgih68 is the string I got.. so following your algorithm explanation I get 61acdb90 maybe I deviated somewhere here.. any help would be appreciated as I am pioneering this for myself..
Tuesday 01.09.2009 on 18:18
Here is ASCII table: http://en.wikipedia.org/wiki/Ascii#ASCII_printable_characters
What you have to do is following: First letter in string is moved 0 places in ascii table. Therefore 6 will be 6, second letter in string is moved one place back therefore 9 will be 8 in decoded string. Third letter in string is “a” moving it two places backwards you get “_” and so on…
Friday 04.12.2009 on 10:11
They change the password sometimes so I made a password generator
you can down load it below
http://www.megaupload.com/?d=PN9YQDKZ
_______________________________
URhonor
Pinoy Rules!!!
Tuesday 05.01.2010 on 12:52
[...] hackthissite.org basic 6 :: encryption system [...]
Friday 23.07.2010 on 06:19
What if you got abc@ED?
I don’t understand when symbols like the greater than sign and @ are used. Also, going back 6 and 7 places from E and D respectively?! It puzzles me.
Friday 23.07.2010 on 06:31
Ha! I got it!
Encrypted password: adei<g?=
Decrypted password: accf8b96
Friday 23.07.2010 on 11:43
Cogratz