• License Key Generator Algorithm For Kids
• License Key Generator Algorithm For Mac

Razvan Cristian 27-Feb-17 11:53 27-Feb-17 11:53 Hi! I used something similar but i extracted the information about motherboard,cpu, integrated audio +integrated video ( if available ), the hdd can be changed.u are licensing the pc not the harddisk. One problem i came across: How can you ensure protection if a user moves your application from pc A ( which is licensed ) to pc B ( but it doesn't execute it ) and it runs it from a pc C as a mapped location from B?

Example Product Key generator - posted in Professional Code: I decided to stray away from using a RSA generated public key as a license key, because it is not easily human readable. Instead, I designed a very simple key generator that outputs keys in the well known 25 character format XXXXX-XXXXX-XXXXX-XXXXX-XXXXX The key generator does not simply generate a unique random product key, but also.

Thanks and have a nice day/night! Nizam11 15-Feb-12 1:21 15-Feb-12 1:21 Hi Sergii. Thanks for this informative article. Really appreciate it. I would like to find out if is it possible to hack the software implementing this algorithm by shipping the software with the public key replaced with a copy of the hacker's self-generated public key. That way, when a user sends the harddrive serial key to the hacker, he can generate the license.dat file using his private key since the public key shipped with the software to the user is the public key pair generated by the hacker.

Am I right to say so? This is partly due to the fact that your code load the public key from a file. As far as I know the public key should be at least hard-coded in the software right? Yasihunter 13-Apr-11 4:28 13-Apr-11 4:28 First, let me appreciate your idea and helpful source code about the “Implementation of The Licensing System for a Software Product”. I want to ask for your help and guidance about a problem that I am facing in developing software which needs self-decryption through runtime. I want to keep my private key secure within the source code. What is the best solution to keep this key secure and out of rich?

I think, if I want to keep the key in resource, it would be extractable by hackers. What is your solution?

1. Reverse Algorithm will generate lage quantities of product keys/serial numbers for any setup program made with a Visual Studio Setup Project. Here are some key features of 'Reverse Algorithm'.
2. License Key Generation Algorithm. A simple software key useful to protect software components Read more. Synthetic data generation — a must-have skill for new data. License-generator GitHub Topics GitHub Read more. A Deep Dive on End-to-End Encryption: How Do Public Key.

VaKa 11-Aug-10 10:06 11-Aug-10 10:06 Very interesting topic. But with good start we have bad finish. Or didnt get it at all I think, it will be more useful explain what you do but not paste here blocks of uncommented code. For example, only from function headers I know that you use RSA (or i miss something ) What coder should do to change you code if he (or she ) want deal with, mmm, 'login name' in corporate network or whatever.?

Good start anyway - Aaaah, my pure english. PatLeCat 10-Aug-10 0:18 10-Aug-10 0:18 I like the topic very much and I thought you started well with explaning at the beginning.

Unfortunately you stop explaining once the 1st line of code appears. You could for example explain the steps in your nice looking scheme diagram and also add more explanation to the code and why you did what you did. After all, an expert in the field doesn't need to read your article, us novices do How to protect the client AND the license manager from being hacked to easily would also be an important chapter to add - methinks. I've been in software development for well over 10 years now and I have come to realize that (software) protection doesn't work. It just keeps honest people honest. Any determined hacker can decompile your application and remove the triggers.

Apps like Windows and Photoshop, games like GTA and COD:MW2, machines like Xbox and Nintendo DS, carriers like DVD and BluRay. Everything has been cracked.

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When a web application develops, we need to protect user passwords from security attacks. When your application operates on a license key, we need to validate the license. In todays world providing security to your system is bit crucial. We have to face malicious scripts, security threats and unwanted attacks in out there. Let’s see how we can prevent those kind of attacks. Password Hashing In hashing, we are going to convert password string into a byte array. Hashing is a one way funtion, we can’t reverse it.

We can see many hashing algorithms available. Let’s say we hashed the users password and stored in our database. When user second time logs in, we have to verify entered password is correct. What we can do is, we can hash the entered text into password field and compare it with the hashed value from the database. Since Hashing is a one way function, we can’t decrypt and retrieve original text.

Invalid username or password When user enters wrong password, System should not let the user know it’s Invalid password, instead of it should tell Invalid username or password. Then if hacker tries to login into your system, he doesn’t know whether username or password got wrong. Hash Functions SHA1, MD5 are popular hashing algorithms. SHA1 got inspired from MD algorithms and created SHA algorithms. From these two algorithms, better to use SHA1, Because it’s high secure than MD5. MD5 is going to convert a string into 128 bits.

But SHA1 convert a string into 160 bits. In MD5 less no of operations required to crack the message, when compared to SHA1. But MD is faster than SHA1. However it’s better to use SHA1 algorithm instead of MD5, since MD5 can be broken easily. Hashes can be cracked easily Hackers can guess passwords and simply hash them with a hashing algorithm and try it in your system. It takes few seconds to generate a hash.

Within a limited amount of time, your passwords can be cracked easily. These type of guessing password and hashing is called as Dictionary attacks and Brute force attacks.

In dictionary attacks, it uses a file with some words. These words can be extracted from a database or else from set of paragraphs. Most hackers guess passwords from common terms like, hello, hellow, he11o3 etc.

They take a string and try to replace letters in it, like hello, he33o, heiio, etc. Then these words are hashed and use against the password hash. Brute Force attacks going to try out every possible of character combinations to a certain string length. It’s a very expensive computational process, But eventually it’s going to find out your password! That’s why we need lenghtier passwords, So it will take long time to crack your passwords. By hashing your passwords, We can’t prevent Dictionary attacks or Brute force attacks, But we can minimize them.

While Dictionary attacks and Brute force attacks are time consuming, Hackers has another kid in their block, It’s Lookup Table. In Lookup table, It’s going to precompute the hashes of passwords and used to store them in a dictionary file.

So hundrends of guesses can be done in a second. It’s a very effective method to crack your passwords. Rainbow Tables, Beware guys, it can crack any 8 characters lengthy MD5 password.

Rainbow table is same as Lookup table. In here hash cracking speed is slower, compared to lookup table. But lookup table size is smaller, so more hashes can be stored in the same space. So Rainbow tables are more effective than Lookup tables. Salted Password Hashing If we use a salt with password hashing, It’s impossible to crack your passwords through Rainbow tables and lookup tables.

In lookup tables, hackers are going to hash same list of passwords and try out in your system. Let’s say two users are having same password in your system. When we hash these passwords, It’s same password hash. In Salting, we are adding a random number along with hashed password. So two users never get same salted password hash. And mind you don’t use same salt with different user passwords, don’t repeat the salting. If new user registers into your system or else change password, generate a new salt.

Use a new salt for every user password. If hacker is smart enough, He may be able to crack a one or two user passwords, But not more than that.

Eventhough many users have same password, Hacker will not be able to crack their passwords using a lookup table. Don’t use shorter salt, Then hacker can create a lookup table to generate every possible salt. Let’s see how we can generate a license key In this example, we are passing usernam and company code to generate a license key. Using GenerateSalt method, we can generate a random number.

License Key Generator Algorithm For Kids

I used to create a 32 bytes lenth salt number using RNGCryptoServiceProvider class. Using Rfc289DeriveVytes class we can generate a salted hashing value. Along with the generated license key, we used to store salted number as well. Let’s see how we can validate the license key.

License Key Generator Algorithm For Mac

I used 64 byte array as a license key and 32 byte array as a salted value. We can use SequenceEqual method to compare entered license key with stored license key as above. You can find a sample application from here.