A number of mini applications

Hi Ivo,
I have got a number of very small Java applications that require building as part of a project I am undertaking, and I was hoping you could assist with these. There are 4 small programs total, which are as follows:

A program that can accept numerical input, and check this against the Luhn algorithm to ensure it is valid (needs a GUI).

A program that can genarate and correct BHC errors.


A brute force program that can break any password which contains a maximum of six lower-case letters and/or numbers.

And finally a program that can run Fermat factorisation, as well as Dixon factorisation.

I'm aware some of these are very specific and might not make much sense, but they are for part of a project and I wanted to know whether you could undertake this work and for how much. I'd also like to add that I can supply documentation which roughly explains how to do these things, all that would be needed is the code, thanks! I look forward to hearing from you!

Kind regards,

Sibby