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Subject: RE: [saml-dev] SAML 2.0 DOS attacks

> Namely, how can and IdP protect against DOS attacks, by 
> restricting allowed authentication requests from certain 
> SP's, when an attacker can easily spoof IP addresses? -- i.e. 
> is there another way, to limit the set of SP's that can 
> initiate user authentication with the IdP?

You could use a local or intermediate packet filter whose policy
restricts access to the IdP from trusted IPs.

An attacker who spoofs a trusted IP address isn't able to mount the more
computationally expensive attacks (eg. TLS-based ones) because the TCP
handshake won't (or shouldn't) complete.


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