[ietf-dkim] 1193 considered harmful

[Michael Thomas]

Arvel Hathcock wrote:
>  > 3) +   can hash a body once for redistribution; a fairly marginal
>  >        feature that might help mass mailers, but Moore's law is just
>  >        as likely to help, um, more.
> 
> For mailing lists which sign their outbound traffic surely this benefit 
> is more than marginal; especially for large lists?  I don't have as much 
> knowledge here as Mike and I'm no crypto expert (thank God for OpenSSL 
> BTW) but isn't the hashing part what takes the longest (sorry if I'm 
> wrong on that).

Most mailing lists that I know of produce one copy of the outgoing
mail with a large number of rcpt-to's, so it's not very important
to them. Where it might be useful is for, say, an outbound marketing
campaign where you send the spam^H^H^H^Hmessage to each recepient
individually.

		Mike