ASCii converter

I am looking for someone to design me a program that can convert ACSii to into hexadecimal form and randomly switch out character or characters back to ACSii Please let me know if this is a project you can do and give me an estimate on a price of what. What it is an app that can convert ascii to hex & dec and Convert Back Save characters or symbols that i dont want converted Maintain the same format and outline that it was put in the program or add html markup Randomly convert characters between ascii and hex and Dec code Convert 1,2 or groups of characters randomly at a time Possibly be able to pick the percentage of random converted characters There is a good example of a well designed interface here. [login to view URL]