Posted by trietptm on 07/08/2013 06:07:07

#1

I could not figure out the mapping between the char and cypher in the encryption level 9 challenge.

Could you help me some ideas to approach this challenge :) ?

http://securityoverride.org/challenges/decryption/9/

Thank you.

Edited by trietptm on 07/08/2013 06:11:11

Posted by Abhinav2107 on 07/08/2013 07:50:43

#2

Try these as inputs:

"aaaaaa"

and

"aabbcc"

Then look at the encrypted forms carefully. It's quite obvious. You should be able to see it.

Posted by vedburtruba on 12/30/2013 07:47:27

#3

I can't figure out what calculation happens for every even symbol. Any hint please?

Posted by vedburtruba on 12/30/2013 08:15:36

#4

Ok, it is solved already. Operation was simillar to every odd symbol (I hope it is not a big hint).

Posted by thetechnophile on 03/02/2014 16:57:27

#5

I did this one manually by making an Excel spreadsheet with all lowercase, uppercase and special symbols and observing their encrypted values. It took me four hours to do this way but I just solved it.

Could anyone PM me with a way they did it that was faster? Programatically? I'd like to learn, please.

And, I hope what I wrote wasn't too much of a hint either. My apologies if it is. I'm still curious to see how others did this.

Anyway, great challenge! Now if only I could get # 5 and 8, life would be grand LOL

Posted by nvr1501 on 04/30/2015 16:23:34

#6

Can somebody give any additional hints for this challenge?

I understand how exactly the encrypted text is organized and can easily decrypt it via symbol table like thetechnophile did. But it's not the right solution I think. I'm completely stuck with an algorithm and that hint for "decimals" is driving me nuts.

Edit:

solved it. Algorithm appeared to be much simpler than it seemed.

Edited by nvr1501 on 05/01/2015 06:53:00