about "Open System" and "Shared System" Authentication Type?
dcbw at redhat.com
Tue Nov 25 09:41:59 EST 2008
On Tue, 2008-11-25 at 17:21 +0800, c4linux c4linux wrote:
> Thanks for your help
> But i found that if I set AP with a password in an OpenSystem
> Authentication, STA can always connect the AP and access its
> resource , Why? OpenSystem Authentication need no password?
You have to separate encryption (WEP/WPA/etc) from authentication
(Shared Key/Open System). For example, WPA uses Open System
exclusively, but it's more secure because it protects the communication
with a strong encryption algorithm.
Open System is used even in unencrypted mode (ie, no WEP or WPA
enabled). But it can also be used with encryption enabled.
It's the _encryption_, not the Open System/Shared Key authentication,
that makes your access point secure more secure with WEP. It sounds
like you've turned off encryption completely.
> 2008/10/16 Dan Williams <dcbw at redhat.com>
> On Thu, 2008-10-16 at 10:20 +0800, c4linux c4linux wrote:
> > >>Open System actually doesn't do authentication.
> > authentication = encryption?
> No, they are different. But Shared Key authentication _uses_
> the WEP
> encryption algorithm as access control.
> > So Why I can do WEP encryption in an Open System
> authentication? I'm
> > confused between authentication and encryption :(
> They are two different things. Authentication determines
> whether or not
> a user is allowed to access the system in the first place,
> encryption protects the content of their messages _after_ they
> have been
> granted access to the system. But to preserve security and
> spoofed authentications, some authentication methods also
> encryption as part of the process, but it's a separate step
> from the
> encryption that happens after the user has gained access to
> the system.
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