How to encrypt your own program with dongle

Using dongle to encrypt and protect programs is a very mature encryption scheme . At present, encryption locks are common in the market ： Thoughtful elite 5, Wei Bu ,safenet. The more established encryption lock companies in China are pondering , Thoughtful lock from elite 4, Up to now, the elite 5, Are relatively good products , High encryption security , Good experience , High cost performance , I recommend this one .

How to encrypt program flow with dongle

1. Get encryption SDK package .
2. Shell the program directly with the shell tool provided by the dongle .
3. Use the control lock and write lock tools to make the matching user lock .
4. Send the encrypted program and supporting user lock to the user .

Encryption lock authorization management

Elite 5 Series of encryption locks can realize software authorization management 、 Remote upgrade and other functions .

1. Time and time limit function . Software is sold by subscription , When the subscription expires, the software license can be upgraded by remote upgrade .
2. Network lock function . Realize a lock on the server in the LAN , Other computers under the same LAN can also use software .
3. Limited function module . Limit the sales of different functional modules of the software .
4. 

The shelling tool encrypts the program flow

Directly transfer the program with encryption exe perhaps dll Drag directly into the shelling tool , Select the function to encrypt , At the same time, choose the protection mode .Virbox Protector There are four ways for shell tools to protect functions ： Code virtualization / Code obfuscation / Code fragmentation / Code encryption .

Code fragmentation is the latest technology to reflect on independent intellectual property rights ： be based on LLVM and ARM Virtual machine technology , Automatically extract massive code and move in SS Kernel mode module , It greatly reduces the use threshold , There is no need to manually migrate algorithms , Portable algorithms have grown from a limited number to almost unlimited , The supported languages are no longer limited to C, This is a comprehensive application of encryption technology , The effect is similar to breaking up the execution of the software , Let the cracker have no way to start . High security 、 It is recommended to call key functions or encryption lock methods ; Using too much will affect efficiency .

Code encryption , Take code blocks as data , Store with permissive encryption function , When the program executes this function, verify the license and solve The secret , The entire block of code is not exposed in memory .

Code virtualization ： in the light of X86 Code ： It refers to translating machine code into a string of pseudo code byte streams that are unrecognizable to both machines and people ; In the specific implementation, we will translate and explain these pseudo codes one by one , Gradually restore to the original code and execute . This subroutine used to translate pseudo code and be responsible for specific execution is called virtual machine VM（ Like an abstract CPU）. It exists as a function , The parameter of the function is the memory address of the bytecode . Due to virtual machine code and virtual machine CPU The implementation of can achieve random design and random execution every time And the code can change randomly every time , Including some logical equivalent changes, you can refer to the hardware N A NAND gate NOT-AND Realize various logic gates , Algorithm and changes in the form of accessing memory , Including non equivalent changes in Mathematics , The code volume can almost expand to 100 To 10000 times , The machine cannot restore the algorithm to the original logic . Code virtualization is characterized by ： Medium safety 、 It doesn't affect efficiency .