automated-security-response-on-aws
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Optional customer managed keys
KMS Customer Managed Keys are expensive.
I'm looking at the cost examples in the documentation. Take the first one, $3.30/month. I believe it's wrong. 10 accounts is 10 keys. That's an extra $10/month.... the first year, then 20, 30 and so on.
Using customer managed keys should be opt-out by parameter.
Or having a shared key on the administrator account.