COOL INVENTIONS - PHOTOS SPEAK FOR THEMSELVES

Resistor values by colors

ZEITGEIST 3 - MOVING FORWARD DOWNLOAD LINK

ZEITGEIST: MOVING FORWARD OFFICIAL RELEASE  2011

Youtube version:

http://www.youtube.com/watch?v=4Z9WVZddH9w

Torrent link for NTSC version (.ISO file) with burning instructions for both dual layer DVD and single layer DVD :

http://thezeitgeistmovement.com/Zeitgeist.Moving.Forward.2011.NTSC.DVDR-VODO.torrent

George Costanza's Words of Wisdom

Reflexive arcade eXpired - Time trial reset script

This is a simple way of resetting time trial of reflexive arcade games.

You have 60 minutes for testing, and then you have to register.

(If your trial is already expired, just reinstall the game

but don't start it, yet.)

Wolfram Mathematica Player 7 - Download link

Get it while it's fresh.Download link.

Stability diagram of LASER resonator

L is resonator length.
r1 and r2 are radiuses of mirrors.
(∨ means 'or')

Stability condition is given by 0≤(1-L/r1)(1-L/r2)≤1

->Stable resonators fall in range: (1-L/r1)(1-L/r2)∈(0,1)

->Marginally stable are for: (1-L/r1)(1-L/r2)=0 ∨ (1-L/r1)(1-L/r2)=1

->Unstable ones are for (1-L/r1)(1-L/r2)<0 ∨ (1-L/r1)(1-L/r2)>1

Math, physics, and engineering java applets

Some educational java applets to help visualize various concepts in math, physics, and engineering.

http://www.falstad.com/mathphysics.html
http://mathdl.maa.org/images/upload_library/4/vol4/kaskosz/derapp.html
http://www.wolframalpha.com/
http://cs.jsu.edu/~leathrum/Mathlets/

Here is a example of a circuit simulator (with pulse generator circuit):

http://www.falstad.com/circuit/

ClassGuard UNGUARDED or How to Crack ClassGuard ?

Quote from the site (http://www.jsecurity.net/modules/faq/faq_0003.html?uri=/classguard/index.html&categoryfolder=/modules/faq/) :

How secure is it really?

There is no way of cracking the used 128Bit AES Encryption. As the main part of ClassGuard is written in C, the key can't be extracted using a Java decompiler. However, there may be possibilities to crack the encryption using a debugger on the assembler level. At the moment, no such attempt is known.

Some experts state, it would be possible to crack byte code encryption by hacking some class files of the Java language itsself, e.g. defineClass() in java.lang.ClassLoader. Bytecode encrypted by ClassGuard is passed through to the virtual machine on the native level. The bytecode never appears in any Java class.

Note the underlined (by me) part in red.
This is (yet another) proof that security by obscurity is a BAD idea.

Classguard is set of java classes and a native library
that encrypts/decrypts java programs (.class files).Classes
must be in .jar archive before you encrypt/protect them.

When started ,your java program gets decrypted in memory.
The native libraries are located in classguard.jar/lib/ .
There are several ,for different OS-es.For windows these are
libcg_x64_win.dllx (64-bit) and lib\libcg_x86_win.dllx (32-bit).

Since library is packed in .jar file,during runtime
it gets unpacked into temporary directory with random name.On windows Xp temp dir is
\Documents and Settings\your_username\Local Settings\Temp\.
Library code is used to decrypt classes in memory.

Let's crack ClassGuard :)
Read more >>

Fixing filter driver problems in Windows XP

(taken from http://djlizard.net/2007/04/30/230/ )

Background information

A filter driver intercepts requests/communication in order to extend or replace functionality in the driver or hardware that it is filtering. There are three types of filter that you should know about: bus filter drivers, upper filter drivers, and lower filter drivers.

A bus filter driver extends functionality (usually for proprietary features) on a bus driver, such as ACPI. An ACPI filter driver, for example, could add additional power management modes or communicate with proprietary modifications to ACPI (such as in laptops).

An upper filter driver filters data between the main driver and the application/operating system service. Microsoft's example: a keyboard filter driver could perform additional security checks before passing the data along to the application or OS/module that is receiving the data.

A lower filter driver filters data between the hardware itself and the main driver, providing extra security/stability or translating proprietary communication into a standard language for the main driver. A good example of this is when you press a button on a piece of hardware: you may have only pressed the button once, but internally, the button may have made electrical contact repeatedly within mere milliseconds, sending more than one signal when only one was intended. A filter driver can recognize that this isn't intended behavior, and can refine the data to expected specifications (it turns multiple contacts into the intended 1 contact). This way, the main driver receives a stream of cleaned/stable data, and from the end user's perspective, everything is OK. Since hardware is physical and anything can go wrong, filter drivers are quite necessary for operating system sanity.

There are two ways to install a filter driver in Windows: at the class level, and at the device level. If you install a keyboard class filter driver, EVERY keyboard you ever install will be filtered by it. If you only install it on the device level (which is done by unique device ID), then it will only filter the exact device that you put it on originally and all other devices, even in the same class, will be unaffected.

Solution to Windows XP wireless AES/WPA2 problem

If your Windows XP computer doesn't seem to recognize AES
(or WPA2) and/or it won't ask for network key ,make sure
that you're running Service Pack 2 and that you have
downloaded and installed KB 917021 or install SP3.

http://support.microsoft.com/kb/917021/en-us

Download the Wireless Client Update package here.