Messages posted by: Reversing...

Giả sử bạn cần tạo 1 file dll có xuất ra một hàm tính tổng
Code:

int sum(int,int)

1. Tạo file mydll.cpp với nội dung:

Code:

extern "C" __declspec(dllexport) int sum(int a, int b)
{
return a + b;
}

2. Dùng Visual Studio Command Prompt gõ lệnh
Code:

cl /LD /EHsc mydll.cpp

3. Ta nhận được 1 file .lib và file .dll . Bây giờ tạo 1 file test.cpp:
Code:

#pragma comment(lib,"mydll")
int main()
{
return sum(1,2);
}

Cám ơn nhiều! Toàn video training hay@

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Code:

Cho a = a[k]...a[1]a[0] = a[1] + a[1]*10 + ... + a[k]*10^k (k+1 chữ số)
a | 7 <=> các số hạng | 7 <=> a[i]*10^i | 7 <=> a[i]*3^i | 7 ( 10^k = 3^k (mod 7) )

3^(k+3) = -3^k (mod 7) => chỉ cần xét 3 phần tử đầu tiên 3^0 mod 7, 3^1 mod 7 và 3^2 mod 7,

chúng lần lượt bằng 1, 3, 2.

Lúc đó 3^3 mod 7 = - 3^0 mod 7 = -1, 3^4 = -3 (mod 7), 3^5 = -2 (mod7)...

Có thể tổng quát.

Có thể dùng đệ quy để giải bài này.

Code:

// r - kết quả.
f(int n, double t, double &r)
{
if ( t < epsilon) return r;
f( n + 1, x*x/n/(n+1), r + t/n );
}

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Tên file vượt quá số kí tự cho phép nên không giải nén được. Đổi tên file lại rồi giải nén là ok.

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C Programming 2007 Tutorials
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CBT Nuggets SQL Server 2005 Implementation and Maintenance Exam-Pack 70-43

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CBT Nuggets Exam-Pack 70-630 Microsoft Office SharePoint Server 2007 Configuring

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The content in the CIW Perl Fundamentals series maps to the exam objectives for exam 1D0-437 from Prosoft/CIWcertified.com. This exam is part of the certification track for Master CIW Web Site Manager and Master CIW Enterprise Developer, fitting under the Web Languages requirement.But, CIW Perl Fundamentals is not just for those on the CIW certification track. If you want to know how to use the building blocks of Web applications, this training will teach you. If you’ve dabbled in web programming, and want to take it to the next level - perhaps even as a career change - this training is what you need. If you want to start downloading Perl scripts and modules, understanding their functionality, and changing that functionality to apply to your specific situation - you’ll be able to do that by the time you’re done studying this training.These videos will give you the fundamental knowledge you need to start developing using Perl. Plus you’ll have the motivation to go much deeper into the language, and the confidence to do so.

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Setup Your Home Network Video Tutorial

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VTC MasterClass Understanding Encryption

Protecting your confidential data, both on your computer and on the Internet, is of paramount importance in today’s world. Encryption is the best measure you can take to protect your data from prying eyes, yet most people don’t understand how it works or how they can use it to keep their data safe. VTC’s resident computer security author Bobby Rogers will show you how encryption works – from the basics to advanced topics – why you need it, and how to make it work for you.

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The Ruby Object Model and Metaprogramming - screencasts - Episode 1: Objects and Classes

Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend.

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The Ruby Object Model and Metaprogramming - screencasts - Episode 2: Sharing Behavior

Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend.

Initially, metaprogramming Ruby can seem really difficult. There are all these unfamiliar terms: singletons, self, metaclasses, and so on. And things never seem to work quite right the first time—Hmm… maybe it’ll work if I change class_eval to instance_eval…

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The Ruby Object Model and Metaprogramming - screencasts - Episode 3: Dynamic Code

Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend.

Initially, metaprogramming Ruby can seem really difficult. There are all these unfamiliar terms: singletons, self, metaclasses, and so on. And things never seem to work quite right the first time—Hmm… maybe it’ll work if I change class_eval to instance_eval…

Well, the good news is that it really isn’t that complex. You just have to understand the underlying model, and everything falls into place. Dave Thomas has been digging into that model for the last ten years, and has a fresh (and simple) way of looking at it. Now you’ll be able to see why metaprogramming works, and how to do it for yourself.

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The Ruby Object Model and Metaprogramming - screencasts - Episode 4: instance_eval and class_eval

The Ruby Object Model and Metaprogramming - screencasts - Episode 4: instance_eval and class_eval
English | 28:56:50 min | 800×600 | PAL (25fps) | MOV | Audio: AAC, mono 44,100 kHz | 15,97 MB

The Ruby Object Model and Metaprogramming

Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend. Learn both the hows and whys of metaprogramming Ruby from Dave Thomas, one of the most experienced Ruby programmers in the western world.

Initially, metaprogramming Ruby can seem really difficult. There are all these unfamiliar terms: singletons, self, metaclasses, and so on. And things never seem to work quite right the first time—Hmm… maybe it’ll work if I change class_eval to instance_eval…

Well, the good news is that it really isn’t that complex. You just have to understand the underlying model, and everything falls into place. Dave Thomas has been digging into that model for the last ten years, and has a fresh (and simple) way of looking at it. Now you’ll be able to see why metaprogramming works, and how to do it for yourself.

It doesn’t matter if you’ve been programming Ruby for a month or for five years. We bet that you’ll learn plenty new in each of these episodes, as Dave digs into both the how and the why of the Ruby object model and metaprogramming.

Episode 4: instance_eval and class_eval

Two of the workhorse methods of metaprogramming are instance_eval and class_eval. They allow you to execute chunks of code dynamically. Here we’ll see how to use them.

* How instance_eval and class_eval differ
* When to use one versus the other
* Breaking down barriers
* Creating methods on the fly, but without using closures
* Defining stuff in classes given a class object
* Writing DSLs in a block structure
http://rapidshare.com/files/127741340/Episode_4_metapro_mov_netbks.com.rar

The Ruby Object Model and Metaprogramming - screencasts - Episode 5: Nine Examples

The Ruby Object Model and Metaprogramming - screencasts - Episode 5: Nine Examples
English | 35:53:00 min | 800×600 | PAL (25fps) | MOV | Audio: AAC, mono 44,100 kHz | 21,11 MB

The Ruby Object Model and Metaprogramming

Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend. Learn both the hows and whys of metaprogramming Ruby from Dave Thomas, one of the most experienced Ruby programmers in the western world.

Initially, metaprogramming Ruby can seem really difficult. There are all these unfamiliar terms: singletons, self, metaclasses, and so on. And things never seem to work quite right the first time—Hmm… maybe it’ll work if I change class_eval to instance_eval…

Well, the good news is that it really isn’t that complex. You just have to understand the underlying model, and everything falls into place. Dave Thomas has been digging into that model for the last ten years, and has a fresh (and simple) way of looking at it. Now you’ll be able to see why metaprogramming works, and how to do it for yourself.

It doesn’t matter if you’ve been programming Ruby for a month or for five years. We bet that you’ll learn plenty new in each of these episodes, as Dave digs into both the how and the why of the Ruby object model and metaprogramming.

Episode 5: Nine Examples of Metaprogramming

Here’s where all the theory and practice comes together! We’ll take a simple problem and find nine different ways of attacking it using metaprogramming techniques.

* Adding behavior directly inside the class
* Using subclassing to add behavior
* Subclassing with a generator using Class.new
* Using a ghost class
* Ghost class with a generator using class_eval
* Rewrite the method with alias_method
* Rewrite using a module
* Rewrite using bind
* Writing a DSL in a block
http://rapidshare.com/files/127743235/Episode_5_metapro_mov_netbks.com.rar

CSS2 Essential Training

Whether you’re an intranet developer responsible for tens of thousands of pages, or a freelance Web designer operating on the cutting edge of technology, CSS 2 is an important tool for your toolbox. Designed specifically for those who have a clear understanding of HTML, this hands-on training tutorial will teach you how Cascading Style Sheets can be used to achieve a new level of fine-grain control over Web design…

http://rapidshare.com/files/126244669/404_ERROR_lcss2_netbks.com.part1.rar
http://rapidshare.com/files/126244729/404_ERROR_lcss2_netbks.com.part2.rar
http://rapidshare.com/files/126244726/404_ERROR_lcss2_netbks.com.part3.rar
http://rapidshare.com/files/126244546/404_ERROR_lcss2_netbks.com.part4.rar

Learning Home and Small Office Networking

About Learning Home and Small Office Networking

Do you have more than one computer in your home or small office? If you do, you need a network! Using the network, you can share a single internet connection between all your computers, transfer files with a few mouse-clicks rather than a pile of floppy disks, and work wirelessly with your laptop from anywhere in the room. You can also use your network for sharing printers, playing music, and vanquishing the enemy in multi-player online games.

Topics covered include:

* Networking Basics
* Router Administration
* Sharing an Internet Connection
* Sharing Files Over a Network
* Other Types of Network Sharing including Printers, Music and Remote Desktops
* Wireless Networks
* Hacks, Tricks, and Other Cool Things
* Troubleshooting

Approximate Running Time: 6.75 Hours

Download

http://rapidshare.com/files/126398197/Home_and_Small_Office_Networking_netbks.com.part1.rar
http://rapidshare.com/files/126398320/Home_and_Small_Office_Networking_netbks.com.part2.rar
http://rapidshare.com/files/126398231/Home_and_Small_Office_Networking_netbks.com.part3.rar
http://rapidshare.com/files/126398333/Home_and_Small_Office_Networking_netbks.com.part4.rar
http://rapidshare.com/files/126398316/Home_and_Small_Office_Networking_netbks.com.part5.rar
http://rapidshare.com/files/126398371/Home_and_Small_Office_Networking_netbks.com.part6.rar
http://rapidshare.com/files/126397541/Home_and_Small_Office_Networking_netbks.com.part7.rar

lynda.com HTML video tutorial

Whether you use a web authoring system or write HTML by hand, you need to know how HTML works. HTML Essential Training is designed to help you understand HTML, its strengths and weaknesses, and how to identify and fix problems in a web page. More than just an HTML tutorial, HTML Essential Training covers the how and the why of HTML documents, including document structure, block and inline level tags, floating images, controlling white space, phrase and font markup, and much more! From setting up a simple web page to adding CSS style sheets and JavaScript rollovers, HTML Essential Training gives you the skills you need to take control of your HTML.

http://rapidshare.com/files/126464640/Learning_HTML_netbks.com.part1.rar
http://rapidshare.com/files/126464145/Learning_HTML_netbks.com.part2.rar

Lynda.com After Effects CS3: Animating Characters

Filmmakers of all kinds are exploring new digital tools for creating animated content. After Effects CS3: Animating Characters follows the creation of a short animated film, from storyboard through final output, using After Effects CS3. George Maestri uses a one-minute monster movie to showcase the new Puppet tool, along with many other techniques for animating characters in After Effects.

Download:

http://rapidshare.com/files/126469503/Lynda_After_Effects_CS3_Animating_Characters_netbks.com.zip.001

http://rapidshare.com/files/126469535/Lynda_After_Effects_CS3_Animating_Characters_netbks.com.zip.002

http://rapidshare.com/files/126469544/Lynda_After_Effects_CS3_Animating_Characters_netbks.com.zip.003

http://rapidshare.com/files/126469537/Lynda_After_Effects_CS3_Animating_Characters_netbks.com.zip.004

http://rapidshare.com/files/126469397/Lynda_After_Effects_CS3_Animating_Characters_netbks.com.zip.005

join files with

http://rapidshare.com/files/126468532/FSJSetup.exe

Cám ơn các bạn đã nhiệt tình tham gia. Mục đích của mình chỉ là học hỏi, cùng một lời giải, nhưng cách phân tích và con đường tìm ra lời giải có thể khác nhau. Vậy rất mong những người tham gia không chỉ cho đáp số, mà nên đưa thêm những phân tích và giải thích ( dù hơi mất công ) , cái này mới thật sự hữu ích.

Nhiệm vụ thứ hai là bằng một cách nào đó vượt qua password của chương trình để nó luôn hiển thị đúng.

Thân.

Địa chỉ ô nhớ là 1 GIÁ TRỊ
BIẾN (định kiểu) có GIÁ TRỊ và có ĐỊA CHỈ.
Con trỏ là một BIẾN.

Hì, tưởng vẫn còn một thằng cx=3 ở đâu đó. smilie

Challenge thứ hai:

target:

Code:

http://rapidshare.com/files/125435312/hehehe.rar.html

2 nhiệm vụ:

1. Xác định pass
2. Bypass

Đơn giản nhất là thay
Code:

mov cx, 3

bởi
Code:

mov cx, 5

còn sau đó bớt 3 rồi lại thêm 3 cũng như không. Thêm vào cái
Code:

push ax

cho cách giải thêm phong phú smilie

hì, sorry các bạn.
pass là : netbks.com.

Tui có vài bài về RE gọi là giải trí, anh em có hứng giải chơi.

Target:
Code:

http://rapidshare.com/files/125190622/coolhacker.rar.html

Trong này có chứa file .com , khi chạy sẽ in ra 3 dòng chữ "Cool Hacker".
Thử thách là: chỉ sửa 1 byte trong binary code để khi chạy thu được 5 dòng "Cool Hacker".

ps: Anh em cho lời giải có càng nhiều lời giải + phân tích càng tốt. Coi như là học tập kinh nghiệm.

Chài, cái này tớ tìm mãi mà không thấy. Thank for sharing.

Hay quá, cám ơn bạn gái rất nhiều , mình đang rất cần cái này.

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