Re: resistance to swamping attacks.
touch@isi.edu Fri, 20 September 1996 17:22 UTC
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Date: Fri, 20 Sep 1996 10:27:56 -0700
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To: kim@morningstar.com, sommerfeld@apollo.hp.com
Subject: Re: resistance to swamping attacks.
Cc: ipsec@TIS.COM
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> > I'm no expert in cryptography, but it seems to me that what is needed is > > a function which is expensive for the originator of a packet to > > calculate, but cheap for the receiver to verify. This will make sure > > that the source of a swamping attack must have a much larger CPU than > > the receiver. I don't know if there are any such functions, but perhaps > > the cryptographically sophisticated among us could enlighten? > > A simple imbalance in "expense" isn't enough -- what if the attacker > does a lot of precomputation before launching the attack? Aren't authentication functions symmetric, almost by definition? Joe ---------------------------------------------------------------------- Joe Touch - touch@isi.edu http://www.isi.edu/~touch/ ISI / Project Leader, ATOMIC-2, LSAM http://www.isi.edu/atomic2/ USC / Research Assistant Prof. http://www.isi.edu/lsam/
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