Web server intermediary for public key authentication

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http://serverfault.com – My home network is currently sitting behind a DD-WRT router that I can access using public key authentication. Whenever I need to access something from my home network I can simply create an SSH tunnel from the DD-WRT router. Providing my private key is kept safe and not compromised, I assume this is a pretty secure setup. However, I would also like to be able to access the router even when I don't have an ssh client available and I only have a web browser available. Can a secure solution be built (or are there existing services available) where I can use a web application (accessible via H (HowTos)