Worldwide authentication

Hi everybody,

One of our client need to authenticate users that are roaming from city
to city.

They don't necessarly own portable PCs.

We need to authenticate the users to let them access data from the
mainframe.

Note that the data is very sensitive.

What is the (esiest/not too expensive) solution?

We are already using Cryptocard/Cisco for our VPN.

We've looked at USB key token, certificates...

Our idea is to use a SSL session with authentication, need to decide
wich authentication solution is best.

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Merci
Mart!
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Pensée de la semaine :  La seule chose que nous ayons à craindre, c'est
que le ciel nous tombe sur la tête. 
Martin M Samson
Chef de projets,