Fix a License key generator program

In Progress

We have a License key generator which generates a set of License keys from a base serial number, it also takes some bits from the date and time so that there cannot be collisions if someone accidentally later creates a set of licenses from overlapping serial number. So for example if I create license keys from 1-100 today, if I generate 90-150 in 6 months none of the License keys will overlap the first set (none at all, but in particular 90-100 where we have specified overlapping serial numbers

The generator part works, but I want to make it reversible (Which it was orginally until we added the date part) so that entering the license key XXXX-YYYY-ZZZZ-AAAA will give me the original serial number and the region of time it was created.

Skills: C Programming

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Project ID: #12224925

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tk2

Hello, I'm a C programmer specialized in cryptography. I've taken a look on your C source code and here's my opinion regarding this problem. The program appends a+b+c+d to string s before encryption. Here: a: More

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LiangXiaoJin

Dear client, how are you? I am a C++ programmer and mathematician. Also Cryptography Specialist. Seems task is VERY APPROPRIATE for me. Especially you can refer my this project: https://www.freelancer.com/projects More

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fattahaabdul

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roadroll

No issue, Regards, Alex

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yemelitc

Interesting but tricky! Hello, I am a hardcore C programmer (as you may see from the link https://github.com/rhyscitlema) and have lots of experience debugging code. From reading your project proposal and having a lo More

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bb14816

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bestit4u

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computingtek

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AbdouAhmaad

I'm an embedded software engineer at valeo so i grantee to you that you will have a very good quality code

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mascotsoft4

Dear Client, Greeting of the day ahead !!! Thanks for providing us opportunity to place bid over the project and communicate with you. I am a serious bidder here and i have already worked on a similar project befor More

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sagipl

Hello, As per your requirement you want fix the license ket generator. Ready to work for your project. Your listed requirements closely match my background and skills. A few I would like to highlight that would ena More

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masterlancer999

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jlmurphysa

Hi, I am an electrical engineer and developer with ample experience in C. mathematics and cryptography. I can fix your code to ensure that you get unique license codes from which you can extract the serial number + d More

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loboto3

I think I understand correctly your issue with adding date data along with an encrypted serial number. It shouldn't be too hard to embed some extra information to retrieve the data while serial number is still included More

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