--- draft-crocker-spam-techconsider-02.txt 2003/11/14 16:37:39 1.1
+++ draft-crocker-spam-techconsider-02.txt 2003/11/14 16:52:25
@@ -566,6 +566,19 @@
is also not clear who should receive the fees or how
they should be disbursed.
+ Another possible form of sender-pays is to impose costs
+ at mail-transaction time without trying to clear them as
+ payments in the real world -- so-called "hash-cash" schemes.
+ The purpose of such techniques is not to compensate the
+ receiver for reading spam but to impose a friction cost on
+ spammers, ideally one that would make bulk-mail prohibitively
+ expensive. Hash-cash schemes rely on the existence of
+ challenge-response methods in which the response is provably
+ expensive to compute. A difficulty with them is that their
+ effectiveness could be diluted or eliminated by techniques
+ such as zombie-flood spamming attacks in which the spammer
+ essentially does not care about the amount of time any one
+ hijacked machine has to spend shipping a spam.
3.3. Filtering
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