Cisco ACS , OpenSSH, Two-Factor Authentication, Foo

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Does anyone know of a PAM module or something that will enable OpenSSH
to work with a hardware token such as a USB key to authenticate a
connecting client to an identity management system such as Cisco ACS?
RSA's SecurID claims to interoperate with OpenSSH; has anyone had any
luck with that product? I'd really prefer to use Cisco's ACS and I'm
hoping to talk with someone that has connected these two in the past.
Ideally, someone will have tried both RSA's ACE and Cisco's ACS.

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