- License Key Generation Software
- License Key Generation Algorithm C Example
- License Key Generation Algorithm C Code
Generating a serial number for product activation. Ask Question Asked 6 years, 11 months ago. The generation of the serial number does not have to be done that way though. If you need that extra metadata maybe you should consider a license file model instead or store a key-meta data mapping somewhere. – Ian Dec 12 '12 at 16:17. A license key should be useable on only one computer (or at least you should be able to control this very tightly) A license key should be short and easy to type or dictate over the phone. You don't want every customer calling the technical support because they don't understand if the key contains a 'l' or a '1'.
-->Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.
Symmetric Keys
The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.
To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.
The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.
When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.
Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.
When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.
Asymmetric Keys
The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.
A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:
- The ToXmlString method, which returns an XML representation of the key information.
- The ExportParameters method, which returns an RSAParameters structure that holds the key information.
Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.
Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.
The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.
See also
Ranch Hand
posted 7 years agoHey all,
I am trying to add software licensing to my software, which I am planning to sell (which means if the license if correct, give access to the software. Else, break the access). I don't have any servers, so unable to connect to them. I am going to use 'Kagi' service to sell my software ( I don't like to use their server support for licensing too, because it is time for me to get some break ). So, I decided to use client side validation. Anyway, I am in a confuse of how to generate the license(the license algorithm) and how to validate it (according to license algorithm). I can do it in my way, but don't like to mess with this security issue, so decided to take your expertise help. Please tell me/show me/give examples for how to create this License Generator, and Validator. And, if you are posting an example with an algorithm, please be kind enough to explain it if you think it is complex. Because then only I can create one of my own
Please help..
I am trying to add software licensing to my software, which I am planning to sell (which means if the license if correct, give access to the software. Else, break the access). I don't have any servers, so unable to connect to them. I am going to use 'Kagi' service to sell my software ( I don't like to use their server support for licensing too, because it is time for me to get some break ). So, I decided to use client side validation. Anyway, I am in a confuse of how to generate the license(the license algorithm) and how to validate it (according to license algorithm). I can do it in my way, but don't like to mess with this security issue, so decided to take your expertise help. Please tell me/show me/give examples for how to create this License Generator, and Validator. And, if you are posting an example with an algorithm, please be kind enough to explain it if you think it is complex. Because then only I can create one of my own
Please help..
Are you better than me? Then please show me my mistakes..
Bartender
posted 7 years agoluck, db
There are no new questions, but there may be new answers.
There are no new questions, but there may be new answers.
Ranch Hand
posted 7 years agoDarryl Burke wrote:Moved from Swing / AWT / SWT / JFace
Thanks Darryl Any help here please?
![License Key Generation Algorithm C# License Key Generation Algorithm C#](/uploads/1/2/6/0/126058669/563685199.jpg)
Are you better than me? Then please show me my mistakes..
Saloon Keeper
posted 7 years agoSee https://coderanch.com/how-to/java/Java-FAQ#licensing for some available options (unless there is a reason you want to roll your own).
Ranch Hand
posted 7 years agoTim Moores wrote:See https://coderanch.com/how-to/java/Java-FAQ#licensing for some available options (unless there is a reason you want to roll your own).
![License Key Generation Algorithm C# License Key Generation Algorithm C#](/uploads/1/2/6/0/126058669/932402126.jpg)
Thanks Tim. Yes, I need to go for one of my own, the reason is, I need to keep it simple.
Are you better than me? Then please show me my mistakes..
Saloon Keeper
posted 7 years agoThat reason sounds fishy. I would imagine that it's far simpler to use an existing solution than to try to roll your own (and make it reliable, safe and easy to use).
Greenhorn
posted 1 year agoLicense Key Generation Software
If using one of the existing solutions (as mentioned by Tim) is not an option for you, you can use RSA to implement a simple and effective licensing mechanism. A good article that explains the background and details is https://build-system.fman.io/generating-license-keys.
I would also recommend obfuscating your Java code, because Java is very easy to decompile.
I would also recommend obfuscating your Java code, because Java is very easy to decompile.
Bartender
posted 1 year agoFrom the referenced website: No license scheme is 100% secure.
As for obfuscated code, I laugh. Back before the DMCA was enacted, I needed a feature for my C compiler that Microsoft's MASM couldn't handle. So I disassembled MASM and patched code into it to give it that feature. MASM wasn't merely obfuscated, it contained no symbolic information whatsoever. Didn't slow me down.
Locks, as they say, are for honest people. I've always counseled paranoid people that if they make their products sufficiently annoying then people WILL crack any protection scheme if only for the challenge of doing so. In the mean time, you've probably crippled the product for those who actually paid for it and you've spent time on 'copy protection' that could have been spent on a better product. There are always those who think it's cool to steal, but a good product at a fair price, people will pay for. Consider the fact that Red Hat not only sells a free enterprise OS system, they even provide an even freer one (CentOS), and they're a billion-dollar corporation.
License Key Generation Algorithm C Example
Besides, this thread is 6 years old. In the IT industry, likely most of the particpants have passed on to other employers twice now, so they wouldn't care anymore.
License Key Generation Algorithm C Code
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