Product Key Generation Algorithm In Java
KEY GENERATION: There is 64 bit key from which 16, 48 bits keys are derived. These keys are derived using key generation algorithm. 64 bits key is gone through a parity drop table, where parity bit of the characters is discarded and permutation is done. Now it becomes 56 bits key, it is divided into two halves ( C 0, D 0) C 0 and D 0.
∟ DsaKeyGenerator.java - Generating DSA Key Pair. This section provides a tutorial example on how to using the Java default implementation of DSA (Digital Signature Algorithm) to generate DSA key pair, public key and private key. Implementing the DSA digital signature algorithm from scratch is not easy. The encryption algorithm or signing algorithm specified for the operation is incompatible with the type of key material in the CMK (CustomerMasterKeySpec). For encrypting, decrypting, re-encrypting, and generating data keys, the KeyUsage must be ENCRYPTDECRYPT. Apr 12, 2016 Basically the generated product-key contains several sections each of which is encoded using one algorithm but the encoding data differs for each section. The product-key generation logic must know the encoding data for all sections as it will generate those sections but the client-installed application should only contain the encoding. When they renew, you have to generate a new key. You record the plaintext name in a file and the file modify time is also part of the hashed string used to create the license key. – S.Lott Apr 15 '10 at 2:26. The algorithm would need to also have a way of expiring.
This chapter demonstrates how to generate an RSA based OpenPGP key pair with OpenPGP Library for Java.
When we create an OpenPGP key pair, a few parameters must be passed. These include:
- Encryption key size in bytes (recommended between 1024 and 3072)
- User ID
- key algorithm (RSA or ELGAMAL)
- private key password
- list of preferred compression algorithms
- list of preferred signature hash algorithms
- list of preferred symmetric encryption algorithms
- key expiration date (optional)
One note regarding the naming convention for the User ID parameter. The original PGP(r) software is delimiting the email in the User ID with < and > like : “Richard C. <richard.c@site.com>”
An overloaded method exists that accepts key expiration date as a last parameter.
Table of Contents
1. Key generation with a KeyStore
2. Key generation directly
3. Exception handling
1. Key generation example
After the key pair is generated usually we will export the public key and send it to our partners.
Below is a screenshot of the generated key properties when we open it with PGP (r) 10:
2. Key generation directly
We can avoid the use of a KeyStore class and generate a key pair in the memory in a PGPKeyPair object. In that case we also have to export it afterwards.
3. Exception Handling
The key pair generation methods simply throw com.didisoft.pgp.PGPException in case the key generation fails.
Summary
Generate ssh login key for non existing server. This chapter demonstrated how to generate an RSA OpenPGP key pair with DidiSoft OpenPGP Library for Java.
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.
luck, db
There are no new questions, but there may be new answers.
Darryl Burke wrote:Moved from Swing / AWT / SWT / JFace
Thanks DarrylAny help here please?
Are you better than me? Then please show me my mistakes.
Tim 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).
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.
I would also recommend obfuscating your Java code, because Java is very easy to decompile.
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.
Product Key Generation Algorithm In Java Pdf
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.Product Key Generation Algorithm In Java 1
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