On Dillema on Thinking and Understanding. Post Ihack2010.

• I'm on holiday that means i have plenty of times improving the arts of "doing nothing".
• The fact that I'm on holiday means that i can open the "Unread Section in all my clouds mail".
• Some of the emails makes me felt annoyed/bugs me off and if I if possible i would like to crush these senders ball.
• 2 noteable email

Q: Do you have CISSP ? we are interested in the game that you designed earlier.....

A: No I only have this one tiny thin low-quality paper printed certificates called ESSSSPPEEEEM.It' a mindblowing Cert that puts your CISSP silent. Your SANS stuttered and of course CEH need i say more?

Q: Bro? Nape solution org ni http://mysabily.blogspot.com/2010/08/i-hack-2010-gerakkerja-hnd-puzzle.html camni?

• The reason I think why the so call security/hacker scene in .my kinda fuzz up these days. It's because people stop thinking and exploring anything that is explorarable.
• A hacker challenged,questioned,modified assumption atment rather then waiting for answer. (Called em crazy scientist if u like)
• The problem lies in the solution. Since solution makes people stop thinking (Referring to awesome tools that exist these days).
• So why does the solution for that puzzle is like dat? For once i hope u students use your unnecessary brains to think "why " rather then "how" on approaching a problem.

Steps on understanding wtf happen to DTMF

1. First accoridng to wiki DTMF is actually the sum of High-Low Frequency in a sinosodial signal.
2. How does a sinosoidal signal look like based on finite time? Since sinosodial is actually a sin wave then the generic equation would be:
3. 
   
4. But since each tone is generated in a specific time frame then then to sample each signal then...
5. That is the generic equation on every sampling signal. But noted that for every signal DTMF is a sum of HIGH and LOW Freq ... From here obviously we should start to thinking "How to discretely analyze each respected frequency in the sinusoidal form" .
6. How do we do it? Think about Rainbow. ou couldn't see rainbow unless you manipulated the refraction index of a glass or water. The concept over here is the same to descretely analyze each sampling signal we can use such technique as DFT (Discrete Fourier Transform ) . To put it simply given a generic DFT Form .where w = normalize radiant freq
7. Now put in Sampling Signal ....
8. We found out that for every computable amplitude in the . frequency can be represented by where A^2 is the signal power.
9. Now if you brain can digest it you simply compute it using octave or matlab for every sampling..
10. Low Freq :
11. High Freq :
12. Base on DTMF Chart: {880,13333} ~= 8 .
13. Calculate for every sampling then u get the answer .
14. Now this is solution....