Digital Certificate Authentication on Linux

Hi, I am interested to see if it is possible to create a Linux module that will: -Port tunnel (forward) IP traffic. -Require the the client computer to have a digital certificate installed. -Have an easy to use web interface -Run on a hardware device like the Linksys WRT54G (eg like OpenWRT or Sveasoft, it might even be a module that runs as part of OpenWRT or Sveasoft) -It doesn't have to perform the full function of a firewall, it only purpose is for tunnelling authenticated traffic. Basically the idea is that I install a certificate in the hardware device and also in the client computer and then only that computer can connect. I am familiar with VPN's but I just want to use tunneling. I basically just want to know if this can be done and how I might go about it. At this stage I don't need it built. I just need an hour or so of consulting about whether it is possible. Happy bidding. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Linux