[Help]Application Protection

Hi, i have made a application which users have to buy to get acess to and i need a free program which i can use to protect the application with serial keys etc

Thanks

If you made such a program why dont you just make another one to do what you want?

You dont even need an algo if you want basic protection you can even host a text file with encrypted or not encrypted keys. Encrypted is better obviously :P.

You do know that, ppl can crack your program in such a way they will accept any key, encrypted or not.

Algorithms.

Make it so Serial keys are in Hex.
Your program will decrypt these to Ascii integers.
Then it will divide by a number, then add 5, etc... Random stuff

and if it = 9 or something then Valid, else Not Valid.

Simple enough

And also, host the algo on a server (and your program downloads and uses the values). Makes it a TON harder for hackers to get the algo each time.

An idea, if you have the winrar right click on your application, add to archive / Advanced set password

Create a simple algorithm like, if every part of the key converted into binary equals to 5 then the key is OK.

A valid key from this algorithm would be - 8904-1228-6673-9377-8281

8904 (decimal) = 10001011001000 (binary) = Add the binary digits = 5
1228 (decimal) = 10011001100 (binary) = Add the binary digits = 5
6673 (decimal) = 1101000010001 (binary) = Add the binary digits = 5
9377 (decimal) = 10010010100001 (binary) = Add the binary digits = 5
8281 (decimal) = 10000001011001 (binary) = Add the binary digits = 5

I coded an example for this in 5 minutes.