On Feb 1, 2010, at 7:45 PM, Venkatesh Sriram wrote:

> Hi,
> 
> Most IETF documents state that replay protection is not provided with
> manual keying. I wanted to understand the reason for the same. Is it
> because with manual keying there is no way to negotiate the sequence
> numbers and thus provision for replay protection is not supported?

And in particular, after a reboot you've lost all knowledge of your sequence 
number space.  (This has been a real issue for WEP; see 
http://www.cs.berkeley.edu/~daw/papers/wep-mob01.ps)

                --Steve Bellovin, http://www.cs.columbia.edu/~smb





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