SSL VPNs -- products that use SSL or TLS to enable browser-based remote access through a VPN gateway -- have been
around for years, but it's only since 2002 that this market has really taken off. I haven't seen any definitive books published about SSL VPNs yet, but I'm sure that will change soon. Most vendors in this market have published technical white papers that describe the capabilities of SSL VPNs and compare them to other approaches like IPsec. Here are some examples:
You might also be interested in reading an article I wrote on this topic for Information Security Magazine.
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