If crackers could justify the resources, they would already now be doing more cracking. It's not like they can just scale their operations ten times all else staying equal. The proposed change in key rotation and publication makes fresh mails only more valuable relative to old messages, not more valuable in general.
If we're looking at cracking-activities from an economic point of view, publishing DKIM keys makes the cracking harder:
1. More accounts need to be cracked fast
2. Timestamped signatures must be published in a timely way
3. Results must be stored until they become useful
These things not only increase cracking expenses, they also increase the threat of detection.
If we're looking at cracking-activities from an economic point of view, publishing DKIM keys makes the cracking harder:
1. More accounts need to be cracked fast
2. Timestamped signatures must be published in a timely way
3. Results must be stored until they become useful
These things not only increase cracking expenses, they also increase the threat of detection.