Product Key Generator Software: Project Description Generates lage quantities of product keys/serial #'s for any setup program made with a Visual Studio Setup Project. Problem Description. Here's a 'proof of concept' demo program implementing my ideas far an algorithm to generate program license keys when a product is purchased. The is then that can be used by the program when the program is activated or run. The algorithm used here is original with me and, as far.

License Key Generator Algorithm Licence Key Generator Key Generation and Verification System component for Microsoft.NET applications (.NET 2.0 and above) A common requirement for software vendors is the inclusion of a system for generating and verifying passwords, which can be bundled with distributed desktop software, or for granting access to online services. App Software's.NET Licence Engine SDK provides a robust, lightweight and tested means of solving this problem. The.NET Licence Engine SDK implements a 'Partial Number Verification System', which along with other features, provides a defence against key generators which may be built to attempt to crack your licence key system. Credit to Brandon Staggs who wrote this article on implementing a partial number verification system in Delphi, from which this C# port borrows: Key benefits of implementing your licence system with the.NET Licence Key Generator are: No 'Phone Home' to verify licence keys is required.

Ability to revoke licence keys if keys found to have been distributed without authorisation. Compiled key verification code cannot be fully reproduced to allow the creation of a key generator (keygen). Keys can be bound to a particular product version if required. Additional benefits: Light weight and fast code execution, tested up to 1,000,000 key generation and verification cycles in 10.2 seconds. Simple to use SDK and sample projects included.

30 day free trial available. How it works (Extended documentation below) A sample project is included at: [project root] Redistributable Samples Sample1.sln To generate a licence key we essentially need two things: A set of arbitrary 'key' bytes that are unique to the application that we want to protect. You are responsible for choosing a random set of bytes to use as your 'keys' A seed that is unique to the context in which a key is being generated, e.g. 1 licence key for 1 user, or 1 licence key for 1 user application id combination. Together, the seed and the byte keys will control the key that is output.

What is unique to this system, is that when validating the licence key, you only test a subset of the total byte keys used to generate the full key. This means that you don't have to distribute all the keys used to create the licence key, and therefore it is harder to create a keygen to crack the keys you generate. A cracker does not have all the information to reverse engineer your key verification system.

With this system, you are able to vary the keys tested on new builds for published versions of your software, and you have the option of generating new byte key sets for new versions. You can vary the number of byte keys used to make longer, stronger keys.

Your validation code will need to know how many keys were used in the generation of a key. Remember that no distributed software can be protected 100% against crackers.

Whatever the technique used to generate a licence key system, all distributed software has the potential to be decompiled and modified to that licence key verification is skipped entirely. Depending on the context in which you distribute your software, you may need to employ obfuscation and other security techniques to make this less likely. Our system provides a simple programming interface, that helps to create a user friendly, cracker resistant means of implementing licence key functionality in your application. Terms of use App Software Ltd and our partners accept no liability for any loss or damage to physical property or intellectual property arising as a result of using our products. Users of our software, licensed or otherwise are expected to undertake their own thorough testing and assessment for suitability of our products before integrating with their solutions. Documentation 1. An Introduction to.NET Licence Engine.NET Licence Engine is an SDK that provides a simple and flexible Partial Key Verification implementation.

Simply put,.NET Licence Engine provides a mechanism for creating and verifying licence keys in. Silvercrest Usb Video Grabber Software Download on this page. NET applications, without requiring the client application to contact the licence server for verification of keys. The system is cracker resistant, as it does not require the client to verify the entire key, only a portion. It is impossible for an attacker to build a key generator from decompiling your executable code alone.

Including.NET Licence Engine in your Projects A sample project is included at: [project root] Redistributable Samples Sample1.sln This wiki contains full documentation for use of.NET Licence Engine, however the interface is small, so you may want to jump straight to a simple client server example using the SDK. To use.NET Licence Engine in your projects, you will need a means of generating user keys, and a means of allowing a user to input their key for verification. This might include: • A server component (e.g. A section on your website where a user purchases software, that generates a licence key for a user). • A client component (e.g.

A section on your distributable application that allows a user to enter a key before the application will activate for use). The server component here is required for generating licence keys. This area of the application will require references to: AppSoftware.LicenceEngine.KeyGenerator.dll AppSoftware.LicenceEngine.Common.dll Referencing these dlls will enable your server component to use insatnces of PkvLicenceKeyGenerator to generate licence keys. The key method on this class has the signature: public string MakeKey(int seed, KeyByteSet[] keyByteSets) It is this method that you will use to generate your licence keys.

The seed argument is what links a generated key to a given user or other entity. If you were simply to use a user id, the same key would always be generated for that user (providing the same values are provided for the argument keyByteSets). A low integer seed value will produce a licence key string with leading zeros, so you may want to add a constant to the seed for generation and verification of keys if this is not desirable. The keyByteSets argument to this method is an array of KeyByteSet objects for which you randomly pick byte values that create they key by which your licence keys are generated. These byte values need not change, until such a time that you want to cause old keys not to validate for subsequent releases of your software (e.g. A new major version release). If you require the ability to be able to create keys for old product versions, you may want to store these byte values in a database and implement logic for generating an appropriate key based on product version.

Note that the longer the KeyByteSet array, the stronger the key, and the longer the licence key string generated. The client component here is required for validating licence keys. This area of the application will require references to: AppSoftware.LicenceEngine.KeyVerification.dll AppSoftware.LicenceEngine.Common.dll Note that it is important that you do not include AppSoftware.LicenceEngine.KeyGenerator.dll with your distributables, or the full bytes used for keyByteSets in key generation. Inclusion of either may make it easier for an attacker to create a keygen for your licence key generation system. Referencing these dlls will enable your server component to use insatnces of PkvKeyCheck to validate licence keys. The key method on this class has the signature: public PkvLicenceKeyResult CheckKey(string key, KeyByteSet[] keyByteSetsToCheck, int totalKeyByteSets, string[] blackListedSeeds) The key argument is the key as provided by the user.

Handling of special characters and letter casing will be handled by this method. The keyByteSetsToCheck argument is the key bytes you have selected to verify. Pass copies of 1 or more (but not all) of the KeyByteSet instances as provided to MakeKey. The ability to verify a key string using only part of the full key is a core feature of the.NET Licence Engine, and means that they full key does not have to be distributed publicly. The totalKeyByteSets should be the same as the length of the full KeyByteSet array used when creating keys. The blackListedSeeds allows you to pass an array of blacklisted seeds should you wish for example to bar any users for using a keys in their possession for future releases of your application. Licence to use: Copyright © 2016 Released under the Creative Commons Attribution 2.0 UK: England & Wales license: THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.


You can probably find most of what you want through google (various articles from shareware authors around the world). If you're making a licensing scheme for software that runs on the end-user's computer, the most important aspects of your problem are how to store license information and how to authenticate purchases such that a new license record will be stored.

You can probably get away with applying a simple encryption algorithm with a known key to your license format in order to store records (with a basic startup check for a set of hardware information which must pass in order to read license data). As for authentication -- there are essentially two common ways to do this. The first is to have a registration server that's always connected to the Internet which validates purchase codes (so you give a customer one of these codes when they've made a purchase -- this can happen 'behind the scenes' if the whole purchase transaction happens in your program). The second way is to use a hash function to map your product information and some other arbitrary values (e.g.: MAC address, HDD label, etc) to a number which is itself run through a similar process to produce another number (they get the first number and they call you to get the second). You can also choose your values with this second method in such a way that your role isn't necessary and there's a code C for every product P such that R(P) = C. A license key is generated using any algorithm you can come up with.

Autotune Effekt Programm. For example: Add all of the ASCII character codes in the name of purchaser, then convert that to a base X number. Append the base (2 digits) to that number. 16A45F The algorithm doesn't have to be complex. The key in and of itself is easy for a hacker to bypass.

They simply jump over the spot in your code that checks if the key is valid. So don't go overboard with fancy key generating algorithms. Instead invest time in creating a great product. I would suggest using a public key crypto system like RSA. Include the public key in your application. Create a signature (using your private key) from some information the user provides (his/her name for example) and make this the registration key.

When the user enters his/her name and the registration key in your application, validate that the signature (the reg key) is valid for the data (the name). If used with a appropriate encryption key length, this should make it impossible to at least create pirate 'key generators'. If your target is Windows 2000 and later, you can use the Microsoft CryptoAPI included in the OS. Does anyone see any problems with this approach? >Does anyone see any problems with this approach? The cracker will create a pirate program patch instead of a key generator, to either patch the public key to his own, fitting to his key generator, or patch the single jump-instruction calling the key checking, to always signaling 'key is okay'. A little more work for the cracker, a LOT more of error-prone work for you which would be better invested in application functionality.

You could add a program integrity checking to disallow patching. The cracker will patch the integrity checking, too. If it is the best solution, well, then it is the proof that there is no solution at all. It is a bit harder to crack and requires more knowledge, but don't forget the thumb rules of security, e.g. You need luck ALL the time, the crackers need luck only once. And never underestimate the motivation. Most of the crackers don't do it for money, but for fun and honor - else they wouldn't publish the cracks and key generators for free.

The harder you make the protection, the more motivated the crackers are to actually crack it. Many security wrappers are cracked, so I'd at least check how well they are faring so if you were considering say, LOCK123 then google for 'LOCK123 crack'. Follow up any hits if you are game but don't use IE to do so. Rather than see your work trashed, consider distributing a genuinely crippled demonstration version of your package that simply does not have any of your full version's features. Purchasers then download the full version rather than just a key when they buy it.

Crackers won't buy anything, they just get their jollies by solving interesting puzzles and claiming cred or load in trojan malware before posting their work to crack sites.