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Since one of the scheduled speakers couldn’t make it because of logistical problems, Eric Allman agreed to step in at the last minute and talk about his latest project, Domain Keys Identified Email, or DKIM. For those of you who don’t know who Eric is, he’s the creator of Sendmail. So when he thinks email needs a new protocol, it’s a big deal. The basic idea is this: we have effective means of encrypting messages so that they can’t be tampered with in transit (PGP, S/MIME). What we don’t have yet is an effective means of verifying that message is from the sender it claims to be from, or of knowing whether we should trust that sender. This is particularly important when attempting to identify spam and trying to prevent the spread of viruses that open up a person’s address book and attempt to replicate using borrowed identities. The DKIM solution is essentially to enforce reverse DNS lookups.
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