I'd like to increase my VPN security, and Google hasn't turned up anything with regard to VPN services and SecurId.
Does anyone know of services like this?
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You could roll your own easily for cheap or free using Amazon's micro EC2 instances (http://aws.amazon.com/free) and our free two-factor auth from Duo (http://duosecurity.com) - either SSH-tunnelled (e.g. ssh -D 1080 my.ec2.host and set your local SOCKS proxy configuration to localhost:1080), or else using OpenVPN, etc.
I don't know of any that autenticate independently, but there are many that will authenticate against a SecurID authentication server. PIX appliances, for example, support this. Try http://www.google.com/search?q=cisco+securid+vpn
They don't provide the VPN itself so not sure if this is quite what you're after but Signify offer a hosted RSA SecurID service. They send you a token and you configure your VPN gateway to talk, over t'Internet to their RADIUS servers for authentication. Pricing is reasonable iirc.
Hamachi employs two factor authentication - they describe a public-private key pair in their security white paper. Combined with the required network password you have a two factor consumer VPN solution (although neither of the factors is a token and a shared password's reliability decreases the more people that know it).
As an alternative you could look at a hosted openVPN solution such as dotBlock's openVPN stack; with full console access you could install WikID.